Nutrition

Nutrition is the that interprets the interaction of  and other substances in  in relation to maintenance, growth, reproduction,  and disease of an organism. It includes food intake,, , , , and.

The of an organism is what it eats,  which is largely determined by the availability and  of foods. For humans, a includes  and storage methods that preserve nutrients from oxidation, heat or leaching, and that reduces risk of es.

In humans, an unhealthy diet can cause deficiency-related diseases such as, , , , and , or nutrient excess health-threatening conditions such as  and ; and such common chronic systemic diseases as , , and. Undernutrition can lead to in acute cases, and the  of  in chronic cases of.

Antiquity
The first recorded dietary advice, carved into a ian stone tablet in about 2500 BC, cautioned those with pain inside to avoid eating s for three days. , later found to be a, was first described in 1500 BC in the.

According to, the study of nutrition probably began during the 6th century BC. In China, the concept of ' developed, a spirit or "wind" similar to what Western Europeans later called '. Food was classified into "hot" (for example, meats, blood, ginger, and hot spices) and "cold" (green vegetables) in China, India, Malaya, and Persia.  developed perhaps first in China alongside qi. Ho the Physician concluded that diseases are caused by deficiencies of elements (: fire, water, earth, wood, and metal), and he classified diseases as well as prescribed diets. About the same time in Italy, (a Greek) wrote of the importance of equilibrium between what goes in and what goes out, and warned that imbalance would result in disease marked by  or.

The first recorded nutritional experiment with human subjects is found in the Bible's. Daniel and his friends were captured by the king of during an invasion of Israel. Selected as court servants, they were to share in the king's fine foods and wine. But they objected, preferring vegetables and water in accordance with their  dietary restrictions. The king's chief steward reluctantly agreed to a trial. Daniel and his friends received their diet for ten days and were then compared to the king's men. Appearing healthier, they were allowed to continue with their diet.

Around 475 BC, stated that food is absorbed by the human body and, therefore, contains "homeomerics" (generative components), suggesting the existence of nutrients. Around 400 BC,, who recognized and was concerned with obesity, which may have been common in southern Europe at the time, said, "Let food be your medicine and medicine be your food." The works that are still attributed to him, , called for and emphasized.

, and other spices were prescribed for various ailments in various preparations for example mixed with vinegar. In the 2nd century BC, believed that  (or the urine of cabbage-eaters) could cure digestive diseases, ulcers, warts, and intoxication. Living about the turn of the millennium,, an ancient Roman doctor, believed in "strong" and "weak" foods (bread for example was strong, as were older animals and vegetables).

Galen to Lind
One mustn't overlook the doctrines of : In use from his life in the 1st century AD until the 17th century, it was to disagree with him for 1500 years. Galen was physician to gladiators in, and in , physician to and the three emperors who succeeded him. Most of Galen's teachings were gathered and enhanced in the late 11th century by at the  in , which still had users in the 17th century. Galen believed in the bodily humours of Hippocrates, and he taught that pneuma is the source of life. (earth, air, fire and water) combine into "complexion", which combines into states (the : sanguine, phlegmatic, choleric, and melancholic). The states are made up of pairs of attributes (hot and moist, cold and moist, hot and dry, and cold and dry), which are made of : blood, phlegm, green (or yellow) bile, and black bile (the bodily form of the elements). Galen thought that for a person to have, , or was scandalous, which Gratzer likens to Samuel Butler's  (1872) where sickness is a crime.

In the 1500s, was probably the first to criticize Galen publicly. Also in the 16th century, scientist and artist compared  to a burning candle. Leonardo did not publish his works on this subject, but he was not afraid of thinking for himself and he definitely disagreed with Galen. Ultimately, 16th century works of, sometimes called the father of modern , overturned Galen's ideas. He was followed by piercing thought amalgamated with the era's mysticism and religion sometimes fueled by the of Newton and Galileo. , who discovered several es such as, performed the first. advanced. measured. Physician modeled the. Physiologist worked out the difference between s and s.

Sometimes forgotten during his life,, a physician in the British navy, performed the first nutrition experiment in 1747. Lind discovered that juice saved sailors that had been at sea for years from, a deadly and painful bleeding disorder. Between 1500 and 1800, an estimated two million sailors had died of scurvy. The discovery was ignored for forty years, after which British sailors became known as "limeys." The essential within citrus fruits would not be identified by scientists until 1932.

Lavoisier and modern science
Around 1770, discovered the details of metabolism, demonstrating that the  of food is the source of body heat. Called the most fundamental chemical discovery of the 18th century, Lavoisier discovered the principle of. His ideas made the of  obsolete.

In 1790, recognized  as necessary for the survival of fowl. In the early 19th century, the elements, , , and were recognized as the primary components of food, and methods to measure their proportions were developed.

In 1816, discovered that dogs fed only s (sugar),  (olive oil), and  died evidently of starvation, but dogs also fed protein survived, identifying  as an essential dietary component. in 1827 was the first person to divide foods into carbohydrates, fat, and protein. During the 19th century, and  quarrelled over their shared belief that animals get their protein directly from plants (animal and plant protein are the same and that humans do not create organic compounds). With a reputation as the leading of his day but with no credentials in, Liebig grew rich making food s like beef  and  that were later found to be of questionable nutritious value. In the 1860s, discovered that body fat can be synthesized from carbohydrate and protein, showing that the energy in blood  can be stored as fat or as.

In the early 1880s, observed that Japanese sailors (whose diets consisted almost entirely of white rice) developed  (or endemic neuritis, a disease causing heart problems and paralysis), but British sailors and Japanese naval officers did not. Adding various types of vegetables and meats to the diets of Japanese sailors prevented the disease, (not because of the increased protein as Takaki supposed but because it introduced a few parts per million of to the diet, later understood as a cure).

In 1896, observed  in thyroid glands. In 1897, worked with natives of, who also suffered from beriberi. Eijkman observed that chickens fed the native diet of white rice developed the symptoms of beriberi but remained healthy when fed unprocessed brown rice with the outer bran intact. His assistant, correctly identified and described the anti-beriberi substance in rice. Eijkman cured the natives by feeding them brown rice, discovering that food can cure disease. Over two decades later, nutritionists learned that the outer rice bran contains vitamin B1, also known as.

From 1900 to the present
In the early 20th century, and  independently measured  energy expenditure in different species of animals, applying principles of physics in nutrition. In 1906, Edith G. Willcock and showed that the amino acid  aids the well-being of mice but it did not assure their growth. In the middle of twelve years of attempts to isolate them, Hopkins said in a 1906 lecture that "unsuspected dietetic factors," other than calories, protein, and, are needed to prevent deficiency diseases. In 1907, and  started the cow feeding,, which took nearly four years to complete.

closed down its nutrition department after World War II because the subject seemed to have been completed between 1912 and 1944. In 1912, coined the term, a vital factor in the diet, from the words "vital" and "amine," because these unknown substances preventing scurvy, beriberi, and , were thought then to be derived from ammonia. The vitamins were studied in the first half of the 20th century.

In 1913, and  discovered the first vitamin, fat-soluble, then water-soluble  (in 1915; now known to be a complex of several water-soluble vitamins) and named  as the then-unknown substance preventing scurvy. and also performed pioneering work on vitamins A and B. In 1919, Sir  incorrectly identified  as a vitamin A deficiency because he could cure it in dogs with cod liver oil. In 1922, McCollum destroyed the vitamin A in cod liver oil, but found that it still cured rickets. Also in 1922, H.M. Evans and L.S. Bishop discover as essential for rat pregnancy, originally calling it "food factor X" until 1925.

In 1925, Hart discovered that trace amounts of are necessary for  absorption. In 1927, synthesized vitamin D, and was awarded the  in Chemistry in 1928. In 1928, isolated, and in 1932 proved that it is vitamin C by preventing scurvy. In 1935, he synthesized it, and in 1937, he won a Nobel Prize for his efforts. Szent-Györgyi concurrently elucidated much of the.

In the 1930s, identified s, necessary protein components that the body cannot synthesize. In 1935, Underwood and Marston independently discovered the necessity of. In 1936, showed that work and school performance are related to caloric intake. In 1938, discovered the chemical structure of vitamin E and then he tragically disappeared. It was synthesised the same year by.

In 1940, took place according to nutritional principles drawn up by  and others. In 1941, the first s (RDAs) were established by the.

In 1992, The U.S. Department of Agriculture introduced the. This replaced the (1956-1992) and was superseded by the concept of  (2011–present).

Nutrients
The list of nutrients that people are known to require is, in the words of, "almost certainly incomplete". As of 2014, nutrients are thought to be of two types: macronutrients which are needed in relatively large amounts, and s which are needed in smaller quantities. A type of carbohydrate,, i.e. non-digestible material such as cellulose, is required, for both mechanical and biochemical reasons, although the exact reasons remain unclear. Some nutrients can be stored - the fat-soluble vitamins - while others are required more or less continuously. Poor health can be caused by a lack of required nutrients, or for some vitamins and minerals, too much of a required nutrient.

Macronutrients
The macronutrients are s,, s, , and. The macronutrients (excluding fiber and water) provide structural material (amino acids from which proteins are built, and s from which cell membranes and some signaling molecules are built) and. Some of the structural material can be used to generate energy internally, and in either case it is measured in s or (often called "Calories" and written with a capital C to distinguish them from little 'c' calories). Carbohydrates and proteins provide 17 kJ approximately (4 kcal) of energy per gram, while fats provide 37 kJ (9 kcal) per gram, though the net energy from either depends on such factors as absorption and digestive effort, which vary substantially from instance to instance. Vitamins, minerals, fiber, and water do not provide energy, but are required for other reasons.

Molecules of carbohydrates and fats consist of carbon, hydrogen, and oxygen atoms. Carbohydrates range from simple s (glucose, fructose and galactose) to complex s (starch). Fats are s, made of assorted s bound to a  backbone. Some fatty acids, but not all, are in the diet: they cannot be synthesized in the body. Protein molecules contain nitrogen atoms in addition to carbon, oxygen, and hydrogen. The fundamental components of protein are nitrogen-containing s, some of which are in the sense that humans cannot make them internally. Some of the amino acids are convertible (with the expenditure of energy) to glucose and can be used for energy production, just as ordinary glucose, in a process known as. By breaking down existing protein, the carbon skeleton of the various amino acids can be metabolized to intermediates in cellular respiration; the remaining ammonia is discarded primarily as urea in urine.

Carbohydrates
Carbohydrates may be classified as s, s, or s depending on the number of monomer (sugar) units they contain. They constitute a large part of foods such as, s, , and other -based products, also , yams, beans, fruits, fruit juices and vegetables. Monosaccharides, disaccharides, and polysaccharides contain one, two, and three or more sugar units, respectively. Polysaccharides are often referred to as complex carbohydrates because they are typically long, multiple branched chains of sugar units.

Traditionally, simple carbohydrates are believed to be absorbed quickly, and therefore to raise blood-glucose levels more rapidly than complex carbohydrates. This, however, is not accurate. Some simple carbohydrates (e.g., fructose) follow different metabolic pathways (e.g., ) that result in only a partial to glucose, while, in essence, many complex carbohydrates may be digested at the same rate as simple carbohydrates. The World Health Organization (WHO) recommends that added sugars should represent no more than 10% of total energy intake.

Fiber
Dietary fiber is a carbohydrate that is incompletely absorbed in humans and in some animals. Like all carbohydrates, when it is metabolized it can produce four Calories (kilocalories) of energy per gram. However, in most circumstances it accounts for less than that because of its limited absorption and digestibility. Dietary fiber consists mainly of cellulose, a large carbohydrate polymer which is indigestible as humans do not have the required enzymes to disassemble it. There are two subcategories: soluble and insoluble fiber. Whole grains, fruits (especially s, s, and ), and vegetables are good sources of dietary fiber. There are many health benefits of a high-fiber diet. Dietary fiber helps reduce the chance of gastrointestinal problems such as and  by increasing the weight and size of stool and softening it. Insoluble fiber, found in, nuts and vegetables, especially stimulates – the rhythmic muscular contractions of the intestines, which move digest along the digestive tract. Soluble fiber, found in oats, peas, beans, and many fruits, dissolves in water in the intestinal tract to produce a gel that slows the movement of food through the intestines. This may help lower blood glucose levels because it can slow the absorption of sugar. Additionally, fiber, perhaps especially that from whole grains, is thought to possibly help lessen insulin spikes, and therefore reduce the risk of. The link between increased fiber consumption and a decreased risk of colorectal cancer is still uncertain.

Fat
A molecule of dietary fat typically consists of several s (containing long chains of carbon and hydrogen atoms), bonded to a. They are typically found as s (three fatty acids attached to one glycerol backbone). Fats may be classified as or  depending on the detailed structure of the fatty acids involved. Saturated fats have all of the carbon atoms in their fatty acid chains bonded to hydrogen atoms, whereas unsaturated fats have some of these carbon atoms, so their molecules have relatively fewer hydrogen atoms than a saturated fatty acid of the same length. Unsaturated fats may be further classified as monounsaturated (one double-bond) or polyunsaturated (many double-bonds). Furthermore, depending on the location of the double-bond in the fatty acid chain, unsaturated fatty acids are classified as or  fatty acids. s are a type of unsaturated fat with trans-isomer bonds; these are rare in nature and in foods from natural sources; they are typically created in an industrial process called (partial). There are nine kilocalories in each gram of fat. Fatty acids such as, catalpic acid, eleostearic acid and , in addition to providing energy, represent potent immune modulatory molecules.

Saturated fats (typically from animal sources) have been a staple in many world cultures for millennia. Unsaturated fats (e. g., vegetable oil) are considered healthier, while trans fats are to be avoided. Saturated and some trans fats are typically solid at room temperature (such as or ), while unsaturated fats are typically liquids (such as  or ). Trans fats are very rare in nature, and have been shown to be highly detrimental to human health, but have properties useful in the industry, such as rancidity resistance.

Essential fatty acids
Most fatty acids are non-essential, meaning the body can produce them as needed, generally from other fatty acids and always by expending energy to do so. However, in humans, at least two fatty acids are and must be included in the diet. An appropriate balance of essential fatty acids— and s—seems also important for health, although definitive experimental demonstration has been elusive. Both of these "omega" long-chain are  for a class of s known as s, which have roles throughout the human body. They are s, in some respects. The omega-3 (EPA), which can be made in the human body from the omega-3 essential fatty acid  (ALA), or taken in through marine food sources, serves as a building block for series 3 prostaglandins (e.g., weakly  PGE3). The omega-6 dihomo-gamma-linolenic acid (DGLA) serves as a building block for series 1 prostaglandins (e.g. anti-inflammatory PGE1), whereas arachidonic acid (AA) serves as a building block for series 2 prostaglandins (e.g. pro-inflammatory PGE 2). Both DGLA and AA can be made from the omega-6 (LA) in the human body, or can be taken in directly through food. An appropriately balanced intake of omega-3 and omega-6 partly determines the relative production of different prostaglandins, which is one reason why a balance between omega-3 and omega-6 is believed important for cardiovascular health. In industrialized societies, people typically consume large amounts of processed vegetable oils, which have reduced amounts of the essential fatty acids along with too much of omega-6 fatty acids relative to omega-3 fatty acids.

The conversion rate of omega-6 DGLA to AA largely determines the production of the prostaglandins PGE1 and PGE2. Omega-3 EPA prevents AA from being released from membranes, thereby skewing prostaglandin balance away from pro-inflammatory PGE2 (made from AA) toward anti-inflammatory PGE1 (made from DGLA). Moreover, the conversion (desaturation) of DGLA to AA is controlled by the enzyme, which in turn is controlled by hormones such as (up-regulation) and  (down-regulation). The amount and type of carbohydrates consumed, along with some types of amino acid, can influence processes involving insulin, glucagon, and other hormones; therefore, the ratio of omega-3 versus omega-6 has wide effects on general health, and specific effects on immune function and, and (i.e., cell division).

Protein
Proteins are structural materials in much of the animal body (e.g. muscles, skin, and hair). They also form the enzymes that control chemical reactions throughout the body. Each protein molecule is composed of s, which are characterized by inclusion of nitrogen and sometimes sulphur (these components are responsible for the distinctive smell of burning protein, such as the in hair). The body requires amino acids to produce new proteins (protein retention) and to replace damaged proteins (maintenance). As there is no protein or amino acid storage provision, amino acids must be present in the diet. Excess amino acids are discarded, typically in the urine. For all animals, some amino acids are ' (an animal cannot produce them internally) and some are ' (the animal can produce them from other nitrogen-containing compounds). About twenty amino acids are found in the human body, and about ten of these are essential and, therefore, must be included in the diet. A diet that contains adequate amounts of amino acids (especially those that are essential) is particularly important in some situations: during early development and maturation, pregnancy, lactation, or injury (a burn, for instance). A complete protein source contains all the essential amino acids; an incomplete protein source lacks one or more of the essential amino acids.

It is possible with s of two incomplete protein sources (e.g., rice and beans) to make a complete protein source, and characteristic combinations are the basis of distinct cultural cooking traditions. However, complementary sources of protein do not need to be eaten at the same meal to be used together by the body. Excess amino acids from protein can be converted into glucose and used for fuel through a process called.

Water
Water is excreted from the body in multiple forms; including and, , and by  in the exhaled breath. Therefore, it is necessary to adequately rehydrate to replace lost fluids.

Early recommendations for the quantity of water required for maintenance of good health suggested that 6–8 glasses of water daily is the minimum to maintain proper. However the notion that a person should consume eight glasses of water per day cannot be traced to a credible scientific source. The original water intake recommendation in 1945 by the Food and Nutrition Board of the read: "An ordinary standard for diverse persons is 1 milliliter for each calorie of food. Most of this quantity is contained in prepared foods." More recent comparisons of well-known recommendations on fluid intake have revealed large discrepancies in the volumes of water we need to consume for good health. Therefore, to help standardize guidelines, recommendations for water consumption are included in two recent (EFSA) documents (2010): (i) Food-based dietary guidelines and (ii) Dietary reference values for water or adequate daily intakes (ADI). These specifications were provided by calculating adequate intakes from measured intakes in populations of individuals with “desirable osmolarity values of urine and desirable water volumes per energy unit consumed.”

For healthful hydration, the current EFSA guidelines recommend total water intakes of 2.0 L/day for adult females and 2.5 L/day for adult males. These reference values include water from drinking water, other beverages, and from food. About 80% of our daily water requirement comes from the beverages we drink, with the remaining 20% coming from food. Water content varies depending on the type of food consumed, with fruit and vegetables containing more than cereals, for example. These values are estimated using country-specific food balance sheets published by the Food and Agriculture Organisation of the United Nations.

The EFSA panel also determined intakes for different populations. Recommended intake volumes in the elderly are the same as for adults as despite lower energy consumption, the water requirement of this group is increased due to a reduction in renal concentrating capacity. and women require additional fluids to stay hydrated. The EFSA panel proposes that pregnant women should consume the same volume of water as non-pregnant women, plus an increase in proportion to the higher energy requirement, equal to 300 mL/day. To compensate for additional fluid output, breastfeeding women require an additional 700 mL/day above the recommended intake values for non-lactating women. Dehydration and over-hydration - too little and too much water, respectively - can have harmful consequences. Drinking too much water is one of the possible causes of, i.e., low serum sodium.

Alcohol (ethanol)
Pure ethanol provides 7 calories per gram. For s, a standard serving in the United States is 1.5 fluid ounces, which at 40% ethanol (80 proof), would be 14 grams and 98 calories. Wine and beer contain a similar range of ethanol for servings of 5 ounces and 12 ounces, respectively, but these beverages also contain non-ethanol calories. A 5 ounce serving of wine contains 100 to 130 calories. A 12 ounce serving of beer contains 95 to 200 calories. According to the U.S. Department of Agriculture, based on 2013-2014 surveys, women ages 20 and up consume on average 6.8 grams/day and men consume on average 15.5 grams/day. Ignoring the non-alcohol contribution of those beverages, the average ethanol calorie contributions are 48 and 108 cal/day. Alcoholic beverages are considered foods because other than calories, these contribute no essential nutrients.

Micronutrients
The micronutrients are, s, and others.

Minerals
Dietary minerals are s required by living organisms, other than the four elements, , , and  that are present in nearly all. The term "mineral" is archaic, since the intent is to describe simply the less common elements in the diet. Some are heavier than the four just mentioned, including several s, which often occur as ions in the body. Some dietitians recommend that these be supplied from foods in which they occur naturally, or at least as complex compounds, or sometimes even from natural inorganic sources (such as from ground  shells). Some minerals are absorbed much more readily in the ionic forms found in such sources. On the other hand, minerals are often artificially added to the diet as supplements; the most famous is likely iodine in which prevents.

Macrominerals
Many elements are essential nutrients called. Some have roles as, while others are s. Elements with recommended dietary allowance greater than 150  mg/day are, in alphabetical order:
 * , a common electrolyte, but also needed structurally (for muscle and digestive system health, bone strength, some forms neutralize acidity, provides signaling ions for nerve and membrane functions)
 * ; electrolyte; see sodium, below
 * , required for processing and related reactions (builds bone, facilitates )
 * , required component of bones; essential for energy processing
 * , an electrolyte (heart and nerve functions)
 * , an electrolyte; common in food and manufactured beverages, typically as . Excessive sodium consumption can deplete and, leading to high blood pressure.

Trace minerals
Many elements are required in trace amounts, usually because they play a role in s. Some trace mineral elements (RDA < 200 mg/day) are, in alphabetical order:
 * required for biosynthesis of family of s.  Animals cannot biosynthesize B12, and must obtain this cobalt-containing vitamin in their diet.
 * required component of many redox enzymes, including
 * required for sugar metabolism
 * required not only for the biosynthesis of but also — it is presumed — for other important organs as breast, stomach, salivary glands, thymus, etc. (see Extrathyroidal ); for this reason iodine is needed in larger quantities than others in this list, and sometimes classified with the macrominerals
 * required for many enzymes, and for and some other proteins
 * (processing of oxygen)
 * required for and related oxidases
 * required for (antioxidant proteins)
 * required for several enzymes such as, , and

Vitamins
Vitamins are essential nutrients, necessary in the diet for good health. ( is an exception, as it can be synthesized in the skin in the presence of, and many animal species can synthesize vitamin C.) Vitamin deficiencies may result in disease conditions, including , , , impaired immune system, disorders of cell metabolism, certain forms of cancer, symptoms of premature aging, and poor , among many others. Excess levels of some vitamins are also dangerous to health. The Food and Nutrition Board of the Institute of Medicine has established Tolerable Upper Intake Levels (ULs) for seven vitamins.

Phytochemicals
Phytochemicals such as s are compounds produced naturally in plants (phyto means "plant" in Greek). In general, the term identifies compounds that are prevalent in plant foods, but are not proven to be essential for human nutrition, as of 2018. There is no conclusive evidence in humans that polyphenols or other non-nutrient compounds from plants confer health benefits, mainly because these compounds have poor, i,e., following ingestion, they are digested into smaller s with unknown functions, then are rapidly eliminated from the body.

While initial studies sought to reveal if s might promote health, one concluded that supplementation with antioxidant vitamins A and E and beta-carotene did not convey any benefits, and may increase risk of death. Vitamin C and selenium supplements did not impact mortality rate. Health effects of non-nutrient phytochemicals such as polyphenols were not assessed in this review.

Intestinal bacterial flora
Animal intestines contain a large population of. In humans, the four dominant are, , , and. They are essential to and are also affected by food that is consumed. Bacteria in the large intestine perform many important functions for humans, including breaking down and aiding in the absorption of fermentable fiber, stimulating cell growth, repressing the growth of harmful bacteria, training the immune system to respond only to pathogens, producing, and defending against some infectious diseases. "s" refers to the idea of deliberately consuming live bacteria in an attempt to change the bacterial population in the large intestine, to the health benefit of the host human or animal. "" refers to the idea that consuming a bacterial energy source such as soluble fiber could support the population of health-beneficial bacteria in the large intestine. There is not yet a scientific consensus as to health benefits accruing from probiotics or prebiotics.

Animal nutrition
and diets are contrasting, with basic  and  proportions vary for their particular foods. Many herbivores rely on bacterial fermentation to create digestible nutrients from indigestible plant cellulose, while obligate carnivores must eat animal meats to obtain certain vitamins or nutrients their bodies cannot otherwise synthesize.

Plant nutrition
Plant nutrition is the study of the s that are necessary for plant growth. There are several principles that apply to plant nutrition. Some elements are directly involved in plant. However, this principle does not account for the so-called beneficial elements, whose presence, while not required, has clear positive effects on plant growth.

A nutrient that is able to limit plant growth according to is considered an essential plant nutrient if the plant cannot complete its full life cycle without it. There are 16 essential plant soil nutrients, besides the three major elemental nutrients carbon and oxygen that are obtained by photosynthetic plants from carbon dioxide in air, and, which is obtained from water.

Plants uptake essential elements from the through their s and from the air (consisting of mainly nitrogen and oxygen) through their. Green plants obtain their carbohydrate supply from the carbon dioxide in the air by the process of. Carbon and oxygen are absorbed from the air, while other nutrients are absorbed from the soil. Nutrient uptake in the soil is achieved by, wherein s pump s (H+) into the soil through s. These hydrogen ions displace s attached to negatively charged soil particles so that the cations are available for uptake by the root. In the leaves, open to take in carbon dioxide and expel. The carbon dioxide molecules are used as the carbon source in photosynthesis.

Although is plentiful in the Earth's atmosphere, very few plants can use this directly. Most plants, therefore, require nitrogen compounds to be present in the soil in which they grow. This is made possible by the fact that largely inert atmospheric nitrogen is changed in a process to biologically usable forms in the soil by bacteria.

Plant nutrition is a difficult subject to understand completely, partially because of the variation between different plants and even between different species or individuals of a given. Elements present at low levels may cause deficiency symptoms, and toxicity is possible at levels that are too high. Furthermore, deficiency of one element may present as symptoms of toxicity from another element, and vice versa.

Government policies
is an example of a government-run nutrition program. Produced by, the guide advises food quantities, provides education on balanced nutrition, and promotes physical activity in accordance with government-mandated nutrient needs. Like other nutrition programs around the world, Canada's Food Guide divides nutrition into four main food groups: vegetables and fruit, grain products, milk and alternatives, and meat and alternatives. Unlike its American counterpart, the Canadian guide references and provides alternative to meat and dairy, which can be attributed to the growing and  movements.

In the US, nutritional standards and recommendations are established jointly by the and  and these recommendations are published as the. Dietary and physical activity guidelines from the USDA are presented in the concept of, which superseded the , which replaced the. The Senate committee currently responsible for oversight of the USDA is the Agriculture, Nutrition and Forestry Committee. Committee hearings are often televised on. The provides a sample week-long menu that fulfills the nutritional recommendations of the government.

Government programs
Governmental organisations have been working on nutrition literacy interventions in non-primary health care settings to address the nutrition information problem in the U.S. Some programs include:

The Family Nutrition Program (FNP) is a free nutrition education program serving low-income adults around the U.S. This program is funded by the Food Nutrition Service’s (FNS) branch of the United States Department of Agriculture (USDA) usually through a local state academic institution that runs the program. The FNP has developed a series of tools to help families participating in the Food Stamp Program stretch their food dollar and form healthful eating habits including nutrition education.

Expanded Food and Nutrition Education Program (ENFEP) is a unique program that currently operates in all 50 states and in American Samoa, Guam, Micronesia, Northern Marianas, Puerto Rico, and the Virgin Islands. It is designed to assist limited-resource audiences in acquiring the knowledge, skills, attitudes, and changed behavior necessary for nutritionally sound diets, and to contribute to their personal development and the improvement of the total family diet and nutritional well-being.

An example of a state initiative to promote nutrition literacy is Smart Bodies, a public-private partnership between the state’s largest university system and largest health insurer, Louisiana State Agricultural Center and Blue Cross and Blue Shield of Louisiana Foundation. Launched in 2005, this program promotes lifelong healthful eating patterns and physically active lifestyles for children and their families. It is an interactive educational program designed to help prevent childhood obesity through classroom activities that teach children healthful eating habits and physical exercise.

Education
Nutrition is in schools in many countries. In, the and Food Technology curricula include nutrition, stressing the importance of a balanced diet and teaching how to read nutrition labels on packaging. In many schools, a Nutrition class will fall within the Family and Consumer Science or Health departments. In some American schools, students are required to take a certain number of FCS or Health related classes. Nutrition is offered at many schools, and, if it is not a class of its own, nutrition is included in other FCS or Health classes such as: Life Skills, Independent Living, Single Survival, Freshmen Connection, Health etc. In many Nutrition classes, students learn about the food groups, the food pyramid, Daily Recommended Allowances, calories, vitamins, minerals, malnutrition, physical activity, healthful food choices, portion sizes, and how to live a healthy life.

A 1985, US report entitled Nutrition Education in US Medical Schools concluded that nutrition education in medical schools was inadequate. Only 20% of the schools surveyed taught nutrition as a separate, required course. A 2006 survey found that this number had risen to 30%. Membership by physicians in leading professional nutrition societies such as the has generally declined from the 1990s.

Professional organizations
In the US, (RDs or RDNs) are  qualified to provide safe, evidence-based dietary advice which includes a review of what is, a thorough review of nutritional health, and a personalized nutritional treatment plan through. They also provide preventive and therapeutic programs at work places, schools and similar institutions. Certified Clinical s or CCNs, are trained health professionals who also offer dietary advice on the role of nutrition in chronic disease, including possible prevention or remediation by addressing nutritional deficiencies before resorting to drugs. Government regulation especially in terms of licensing, is currently less universal for the CCN than that of RD or RDN. Another advanced Nutrition Professional is a Certified Nutrition Specialist or CNS. These Board Certified Nutritionists typically specialize in and. In order to become board certified, potential CNS candidate must pass an examination, much like Registered Dieticians. This exam covers specific domains within the health sphere including; Clinical Intervention and Human Health.

Nutrition literacy
The findings of the 2003 National Assessment of Adult Literacy (NAAL) provide a basis upon which to frame the nutrition literacy problem in the U.S. NAAL introduced the first ever measure of "the degree to which individuals have the capacity to obtain, process and understand basic health information and services needed to make appropriate health decisions" – an objective of Healthy People 2010 and of which nutrition literacy might be considered an important subset. On a scale of below basic, basic, intermediate and proficient, NAAL found 13 percent of adult Americans have proficient health literacy, 44% have intermediate literacy, 29 percent have basic literacy and 14 percent have below basic health literacy. The study found that health literacy increases with education and people living below the level of poverty have lower health literacy than those above it.

Another study examining the health and nutrition literacy status of residents of the lower Mississippi Delta found that 52 percent of participants had a high likelihood of limited literacy skills. While a precise comparison between the NAAL and Delta studies is difficult, primarily because of methodological differences, Zoellner et al. suggest that health literacy rates in the Mississippi Delta region are different from the U.S. general population and that they help establish the scope of the problem of health literacy among adults in the Delta region. For example, only 12 percent of study participants identified the My Pyramid graphic two years after it had been launched by the USDA. The study also found significant relationships between nutrition literacy and income level and nutrition literacy and educational attainment further delineating priorities for the region.

These statistics point to the complexities surrounding the lack of health/nutrition literacy and reveal the degree to which they are embedded in the social structure and interconnected with other problems. Among these problems are the lack of information about food choices, a lack of understanding of nutritional information and its application to individual circumstances, limited or difficult access to healthful foods, and a range of cultural influences and socioeconomic constraints such as low levels of education and high levels of poverty that decrease opportunities for healthful eating and living.

The links between low health literacy and poor health outcomes has been widely documented and there is evidence that some interventions to improve health literacy have produced successful results in the primary care setting. More must be done to further our understanding of nutrition literacy specific interventions in non-primary care settings in order to achieve better health outcomes.

Malnutrition
According to WHO, malnutrition refers to deficiencies, excesses, or imbalances in a person’s intake of energy and/or nutrients. The term malnutrition addresses 3 broad groups of conditions: undernutrition, which includes wasting (low weight-for-height), stunting (low height-for-age) and underweight (low weight-for-age); micronutrient-related malnutrition, which includes micronutrient deficiencies or insuficiencies (a lack of important vitamins and minerals) or micronutrient excess; and overweight, obesity and diet-related noncommunicable diseases (such as heart disease, stroke, diabetes and some cancers). In, the  and the  trained women's groups to make equinut, a healthy and nutritional version of the traditional recipe di-dèguè (comprising peanut paste, honey and millet or rice flour). The aim was to boost nutrition and livelihoods by producing a product that women could make and sell, and which would be accepted by the local community because of its local heritage.

Insufficient
The U.S. Food and Nutrition Board sets Estimated Average Requirements (EARs) and Recommended Dietary Allowances (RDAs) for vitamins and minerals. EARs and RDAs are part of s. The DRI documents describe nutrient deficiency signs and symptoms.

Excessive
The U.S. Food and Nutrition Board sets Tolerable Upper Intake Levels (known as ULs) for vitamins and minerals when evidence is sufficient. ULs are set a safe fraction below amounts shown to cause health problems. ULs are part of s. The also reviews the same safety questions and set its own ULs.

Unbalanced
When too much of one or more nutrients is present in the diet to the exclusion of the proper amount of other nutrients, the diet is said to be unbalanced. High calorie food ingredients such as vegetable oils, sugar and alcohol are referred to as because they displace from the diet foods that also contain protein, vitamins, minerals and fiber.

Mental agility
Health and nutrition appear to have close links with overall educational success.

Mental disorders
Nutritional supplement treatment may be appropriate for major, , , and , the four most common mental disorders in developed countries. Supplements under study for possible effects on mood elevation and stabilization include and, which are s in.

Processed foods
Since the some two hundred years ago, the food processing industry has invented many  that both help keep foods fresh longer and alter the fresh state of food as they appear in nature. Cooling is the primary technology used to maintain freshness, whereas many more technologies have been invented to allow foods to last longer without becoming spoiled. These latter technologies include, , , , and separation of various components, all of which appearing to alter the original nutritional contents of food. Pasteurisation and autoclavation (heating techniques) have no doubt improved the safety of many common foods, preventing epidemics of bacterial infection. But some of the (new) food processing technologies have downfalls as well.

Modern separation techniques such as, , and have enabled concentration of particular components of food, yielding flour, oils, juices, and so on, and even separate fatty acids, amino acids, vitamins, and minerals. Inevitably, such large-scale concentration changes the nutritional content of food, saving certain nutrients while removing others. Heating techniques may also reduce food's content of many heat-labile nutrients such as certain vitamins and phytochemicals, and possibly other yet-to-be-discovered substances. Because of reduced nutritional value, processed foods are often 'enriched' or 'fortified' with some of the most critical nutrients (usually certain vitamins) that were lost during processing. Nonetheless, processed foods tend to have an inferior nutritional profile compared to whole, fresh foods, regarding content of both sugar and high GI starches, /, vitamins, fiber, and of intact, unoxidized (essential) fatty acids. In addition, processed foods often contain potentially harmful substances such as oxidized fats and trans fatty acids.

A dramatic example of the effect of food processing on a population's health is the history of epidemics of in people subsisting on polished rice. Removing the outer layer of rice by polishing it removes with it the essential vitamin, causing beri-beri. Another example is the development of among infants in the late 19th century in the United States. It turned out that the vast majority of sufferers were being fed milk that had been heat-treated (as suggested by ) to control bacterial disease. Pasteurisation was effective against bacteria, but it destroyed the vitamin C.

As mentioned, lifestyle- and obesity-related diseases are becoming increasingly prevalent all around the world. There is little doubt that the increasingly widespread application of some modern food processing technologies has contributed to this development. The food processing industry is a major part of modern economy, and as such it is influential in political decisions (e.g., nutritional recommendations, agricultural subsidising). In any known profit-driven economy, health considerations are hardly a priority; effective production of cheap foods with a long shelf-life is more the trend. In general, whole, fresh foods have a relatively short shelf-life and are less profitable to produce and sell than are more processed foods. Thus, the consumer is left with the choice between more expensive, but nutritionally superior, whole, fresh foods, and cheap, usually nutritionally inferior, processed foods. Because processed foods are often cheaper, more convenient (in both purchasing, storage, and preparation), and more available, the consumption of nutritionally inferior foods has been increasing throughout the world along with many nutrition-related health complications.

Dangers of poor nutrition

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Amino acids

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Standard amino acids


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Other amino acids