nutrition

(physiology) the organic process of nourishing or being nourished

the processes by which an organism assimilates food and uses it for growth and maintenance a source of materials to nourish the body the scientific study of food and drink (especially in humans)

Nutrition is the study of the relationship between diet and states of health and disease. It is defined as the study of food. Absence of adequate nutrients can cause certain diseases to take hold that can potentially result in death.Between the extremes of optimal health and death from starvation or malnutrition, there is an array of disease states that can be caused or alleviated by changes in diet. Deficiencies, excesses and imbalances in the diet can produce negative impacts on health, which may result in diseases such as scurvy, obesity or osteoporosis. Also, excess ingestion of elements that have no apparent role in health (e.g. lead, mercury (element)mercury, PCBPCBs, dioxins) may have toxic and potentially lethal effects depending on dose.The science of nutrition attempts to understand how and why specific aspects of diet have specific influences on health.

Overview - The human body comprises chemical compounds such as water, amino acids (proteins), fatty acids (lipids), nucleic acids (DNA/RNA), and carbohydrates (e.g. sugars). These compounds in turn consist of chemical elementelements such as carbon, hydrogen, oxygen, nitrogen, and phosphorus, and may or may not contain minerals such as calcium, iron, and zinc. Minerals also ubiquitously occur in the form of salts and electrolytes. All of these chemical compounds and elements occur in various forms and combinations (e.g. hormones/vitamins, phospholipids, hydroxyapatite), both in the human body and in organisms (e.g. plants, animals) that humans eat.The human body must necessarily comprise those elements that humans eat and absorb into the bloodbloodstream. The digestive system, except in the unborn fetus, is the first step in helping to make the different chemical compounds and elements in food available for the trillions of Cell (biology)cells of the body. In the digestive process of an average adult, about seven (7) litres of liquid, known as digestive juices, exit the internal body and enter the lumen of the digestive tract. The digestive juices help break chemical bonds between ingested compounds as well as modulate the conformation and/or energetic state of the compounds/elements. Yet many compounds/elements are absorbed into the bloodstream unchanged, though the digestive process helps to release them from the matrix of the foods where they occur. Any unabsorbed matter is eliminated in the feces. Only a minimal amount of digestive juice is eliminated this way; the intestines reabsorb most of it otherwise the body would rapidly dehydrate (hence the devastating effects of persistent diarrhea).Study in this field must take into careful account the state of the body before ingestion and after digestion as well as the chemical content of both the food and the waste. The specific types of compounds and elements that are absorbed by the body can be determined by comparing the waste to the food. The effect that the absorbed matter has on the body can be determined by finding the difference between the pre-ingestion state and the post-digestion state. The effect may only be discernible after an extended period of time in which all food and ingestion must be exactly regulated and all waste must be analyzed. The number of variables (e.g. 'confounding factors') involved in this type of experimentexperimentation is very high. This makes sciencescientifically valid nutritional study very time-consuming and expensive, which accounts for why a proper science of human nutrition is rather new.In general, eating a variety of fresh, whole (unprocessed) foods has proven hormonally and metabolically favourable compared to eating a monotonous diet based on processed foods. In particular, fresh, whole foods provide higher amounts and a more favourable balance of essential and vital nutrients per unit of energy, resulting in better management of cell growth, maintenance, and mitosis (cell division) as well as of appetite and energy balance. A generally more regular eating pattern (e.g. eating medium-sized meals every 3 to 4 hours) has also proven more hormonally and metabolically favourable than infrequent, haphazard food intake.

Nutrition and health - Ill health can be brought about by an imbalance of nutrients, producing either an excess or deficiency which in turn affects body functioning in a cumulative manner. Moreover, because most nutrients are, in some way or the other, involved in cell-to-cell signalling (e.g. as building block or part of a hormone or signalling cascadesignalling 'cascades'), deficiency or excess of various nutrients affects hormonal function also ''indirectly''. Thus, because they largely regulate the expression of genes, hormones represent a link between nutrition and how our genes are expressed, i.e. our phenotype. The strength and nature of this link are continually under investigation, but observations especially in recent years have demonstrated a pivotal role for nutrition in hormonal activity and function and therefore in health.Mineral and/or vitamin (tocotrienol and tocopherol) deficiency or excess may yield symptoms of diminishing health such as goitre, scurvy, osteoporosis, weak immune system, disorders of cell metabolism, certain forms of cancer, symptoms of premature aging, and poor psychologypsychological health (including eating disorders). The list goes on and on; for reference, see ''Modern Nutrition in Health and Disease'' by Shils et al.As of 2005, twelve vitamins and about the same number of minerals are recognized as 'essential nutrients', meaning that they must be consumed and absorbed - or, in the case of vitamin D, alternatively synthesized via UVB radiation - to prevent deficiency symptoms and death. Certain vitamin-like substances found in foods, such as carnitine, have also been found essential to survival and health, but these are not strictly 'essential' to eat because the body can produce them from other compounds. Moreover, thousands of different phytochemicals have recently been discovered in food (particularly in fresh vegetables), which have many discovered and yet to be discovered properties including antioxidant activity (see below). Other essential nutrients include essential amino acidessential amino acids, choline and the essential fatty acidessential fatty acids.In addition to sufficient intake, an appropriate balance of essential fatty acids - omega-3 and omega-6 fatty acidomega-6 fatty acids - has been discovered to be crucial for maintaining health. Both of these unique "omega" long-chain unsaturated fatpolyunsaturated fatty acids are substratesubstrates for a class of eicosanoids known as prostaglandins. The omega-3 eicosapentaenoic acid (EPA) (which can be made in the body from the omega-3 essential fatty acid alpha-linolenic acid (LNA), or taken in through marine food sources), serves as building block for series 3 prostaglandins (e.g. weakly-inflammatoryinflammation PGE3). The omega-6 dihomo-gamma-linolenic acid (DGLA) serves as building block for series 1 prostaglandins (e.g. anti-inflammatory PGE1), whereas arachidonic acid (AA) serves as building block for series 2 prostaglandins (e.g. pro-inflammatory PGE1). Both DGLA and AA are made from the omega-6 linoleic acid (LA) in the 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 partly explains the importance of omega-3/omega-6 balance for cardiovascular health. In industrialised societies, people generally consume large amounts of processed vegetable oils that have reduced amounts of essential fatty acids along with an excessive amount of omega-6 relative to omega-3.The rate of conversions of omega-6 DGLA to AA largely determines the production of the respective 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 delta-5-desaturase, which in turn is controlled by hormones such as insulin (up-regulation) and glucagon (down-regulation). Because different types and amounts of food eaten/absorbed affect insulin, glucagon and other hormones to varying degrees, not only the amount of omega-3 versus omega-6 eaten but also the general composition of the diet therefore determine health implications in relation to essential fatty acids, inflammation (e.g. immune function) and mitosis (i.e. cell division).Several lines of evidence indicate lifestyle-induced hyperinsulinemia and reduced insulin function (i.e. insulin resistance) as a decisive factor in many disease states. For example, hyperinsulinemia and insulin resistance are strongly linked to chronic inflammation, which in turn is strongly linked to a variety of adverse developments such as arterial microinjuries and clot formation (i.e. heart disease) and exaggerated cell division (i.e. cancer). Hyperinsulinemia and insulin resistance (the so-called metabolic syndrome) are characterized by a combination of abdominal obesity, elevated blood sugar, elevated blood pressure, elevated blood triglycerides, and reduced HDL cholesterol. The negative impact of hyperinsulinemia on prostaglandin PGE1/PGE2 balance may be significant.The state of obesity clearly contributes to insulin resistance, which in turn can cause type 2 diabetes. Virtually all obese and most type 2 diabetic individuals have marked insulin resistance. Although the association between overfatness and insulin resistance is clear, the exact (likely multifarious) causes of insulin resistance remain less clear. Importantly, it has been demonstrated that appropriate exercise, more regular food intake and reducing glycemic load (see below) all can reverse insulin resistance in overfat individuals (and thereby lower blood sugar levels in those who have type 2 diabetes).Overfatness can unfavourably alter hormonal and metabolic status via resistance to the hormone leptin, and a vicious cycle may occur in which insulin/leptin resistance and overfatness aggravate one another. The vicious cycle is putatively fuelled by continuously high insulin/leptin stimulation and fat storage, as a result of high intake of strongly insulin/leptin stimulating foods and energy. Both insulin and leptin normally function as satiety signals to the hypothalamus in the brain; however, insulin/leptin resistance may reduce this signal and therefore allow continued overfeeding despite large bodyfat stores. In addition, reduced leptin signalling to the brain may reduce leptin's normal effect to maintain an appropriately high metabolic rate.There is debate about how and to what extent different dietary factors - e.g. intake of processed carbohydrates, total protein, fat, and carbohydrate intake, intake of saturated and trans fatty acids, and low intake of vitamins/minerals - contribute to the development of insulin- and leptin resistance. In any case, analogous to the way modern man-made pollution may potentially overwhelm the environment's ability to maintain 'homeostasis', the recent explosive introduction of high Glycemic Index- and processed foods into the human diet may potentially overwhelm the body's ability to maintain homeostasis and health (as evidenced by the metabolic syndrome epidemic).Antioxidants are another recent discovery. As cellular metabolism/energy production requires oxygen, potentially damaging (e.g. mutation causing) compounds known as radical oxygen species or free radicals may form. For normal cellular maintenance, growth, and division, these free radicals must be sufficiently neutralized by antioxidant compounds, such as certain vitamins (vitamin C, vitamin E, vitamin K and the aforementioned phytochemicals as well as other compounds, some of which the body itself produces. Different antioxidants are now known to function in a cooperative network, e.g. vitamin C can reactivate free radical-containing glutathione or vitamin E by accepting the free radical itself, and so on.It is now also known that the human digestion system contains a population of a range of bacteria which are essential to digestion, and which are also affected by the food we eat. The role and significance of the intestinal bacterial flora is under investigation.

Nutrition and longevity - Lifespan is somehow related to the amount of food energy consumed: this was first systematically investigated in the seminal study by Weidruch, et al. (1986). A pursuit of this principle of caloric restriction followed, involving research into longevity of those who reduced their food energy intake while attempting to optimize their micronutrient intake. Perhaps not surprisingly, some people found that cutting down on food reduced their quality of life so considerably as to negate any possible advantages of lengthening their lives. However, a small set of individuals persists in the lifestyle, going so far as to monitor blood lipid levels and glucose response every few months. See calorierestriction.org - Calorie Restriction Society.Underlying this research was the hypothesis that oxidative damage was the agent which accelerated aging, and that aging was retarded when the amount of carbohydrates (and thereby insulin release) was reduced through dietary restriction.However, recent research has produced increased longevity in animals (and shows promise for increased human longevity) through the use of insulin uptake retardation. This was done through altering an animal’s metabolism to allow it to consume similar food-energy levels to other animals, but without building up fatty tissue. (Bluher et al, 2003)This has set researchers off on a line of study which presumes that it is not low food energy consumption which increases longevity. Instead, longevity may depend on an efficient fat processing metabolism, and the consequent long term efficient functioning of our organs free from the encumbrance of accumulating fatty deposits. (Das et al, 2004) Thus, longevity may be related to maintained insulin sensitivity. However, several other factors including low body temperature seem to promote longevity also and it is unclear to what extent each of them contribute.Antioxidants have recently come to the forefront of longevity studies which have included the FDA and brunswicklabs.com - Brunswick labs. In 2005 the FDA issued a statement recommending that Americans should be consuming 7,000 ORAC units daily or 12 full servings of fruit in order to curb the cancer epidemic. The dietary supplement industry has responded by shifting focus away from hormone replacements to “super” antioxidants such as proleva.com - Proleva which contain whole fruit extracts and ORAC scores near 5,000 units mark or two thirds of the new level set by the FDA.

Nutrition, industry and food processing - Since the Industrial Revolution some two hundred years ago, the food processing industry has invented many technologytechnologies that both help keep foods fresh longer and alter the fresh state of food as they appear in nature. Cooling is the primary technology that can help maintain freshness, whereas many more technologies have been invented to allow foods to last longer without becoming spoiled. These latter technologies include pasteurisation, autoclavation, drying, salting, and separation of various components, and all appear 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 undoubtedly have downfalls as well.Modern separation techniques such as milling, centrifugation, and pressing have enabled upconcentration 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 upconcentration 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 than do whole, fresh foods, regarding content of both sugar and high GI starches, potassium/sodium, vitamins, fibre, 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 beri-beri in people subsisting on polished rice. Removing the outer layer of rice by polishing it removes with it the essential vitamin thiamin, causing beri-beri. Another example is the development of scurvy among infants in the late 1800's 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 Pasteur) 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.

Policy advice and guidance on nutrition - Most Governments provide guidance on good nutrition, and some also impose mandatory labelling requirements upon processed food manufacturers to assist consumers in complying with such guidance. Current dietary guidelines in the United States are presented in the concept of a MyPyramidfood pyramid. There is no apparent consisteny in science-based nutritional recommendations between countries, indicating the role of politics as well as cultural bias in research emphasis and interpretation.

Current issues and challenges - Challenging issues in modern nutrition include''Artificial' interventions in food production and supply:

Should genetic engineering be used in the production of food crops and animals?

Are the use of pesticides, and fertilizers damaging to the foods produced by use of these methods (see also organic farming)?

Are the use of antibiotics and hormones in animal farming ethical and/or safe?Sociological issues:

How do we minimise the current disparity in food availability between first and third world populations (see famine and poverty)?

How can public advice agencies, policy making and food supply companies be coordinated to promote healthy eating and make wholesome foods more convenient and available?

Do we need dietary supplementnutritional supplements in the form of pills, powders, liquids, etc.?

How can the developed world promote good worldwide nutrition through minimising import tariffs and export subsidies on food transfers?Research Issues:

How do different nutrients affect appetite and metabolism, and what are the molecular mechanisms?

What yet to be discovered important roles do vitamins, minerals, and other nutrients play in metabolism and health?

Are the current recommendations for intake of vitamins and minerals generally too low?

How and why do different cell types respond differently to chronically elevated circulating levels of insulin, leptin, and other hormones?

What does it take for insulin resistance to develop?

What other molecular mechanisms may explain the link between nutrition and lifestyle-related diseases?

What role does the intestinal bacterial flora play in digestion and health?

How essential to proper digestion are the enzymes contained in food itself, which are usually destroyed in cooking (see Living foods diet)?

What more can we discover through what has been called the phytochemical revolution?

See also - For detailed information, see related entries in the following categories:Food:

Famine

Fast food

Slow Food

Vegetarianism

Paleolithic dietHealth:

Auxology

Digestion

Eating disorders

Natural Hygiene

Health

Healthy eating

Illnesses related to poor nutrition

Obesity

Caloric restrictionResearch: '''

Cell_(biology)Cells

China project

Enzyme

Essential amino acid

Essential fatty acid

Phytochemicals

!List_of_publications_in_medici ne#Nutrition Important publications in nutrition

References -

Shils et al. (2005) ''Modern Nutrition in Health and Disease'', Lippincott Williams and Wilkins. ISBN: 0781741335.

Bluher, Khan BP, Kahn CR, ''Extended longevity in mice lacking the insulin receptor in adipose tissue.'' ''Science (journal)Science'' 299(5606): 572-4, Jan 24, 2003.

''The Times'' newspaper, January 31 2004 ''Could vitamins help delay the onset of Alzheimer’s?'' by Jerome Burne.

''The Times'' newspaper February 28, 2004 ''Autism: I can see clearly now . . .'' by Simon Crompton

''The Times'' newspaper March 10, 2004 ''Work up an Amish appetite'' by Anne-Celine Jaeger

Das M, Gabriely I, Barzilai N.''Caloric restriction, body fat and aging in experimental models.'' Obes Rev. 2004 Feb;5(1):13-9.

William Eaton et al ''Coeliac disease and schizophrenia'' British Medical Journal, February 21, 2004.

Janssen I, Katzmarzyk PT, Ross R. ''Waist circumference and not body mass index explains obesity-related health risk.'' Am J Clin Nutr. 2004 Mar;79(3):379-84.

J Mei, SSC Yeung et al "High dietary phytoestrogen intake and bone mineral density in postmenopausal women."Journal of Clinical Endocrinology and Metabolism, 2001, Vol 86, Iss 11

Merritt JC "Metabolic syndrome: soybean foods and serum lipids."J Natl Med Assoc. 2004 Aug;96(8):1032-41.

Sobczak S, et al ''Lower high-density lipoprotein cholesterol and increased omega-6 polyunsaturated fatty acids in first-degree relatives of bipolar patients'' Psychol Med. 2004 Jan;34(1):103-12.

Walter C. Willett and Meir J. Stampfer,''Rebuilding the Food Pyramid'', Scientific American January 2003.

Weindruch R, et al. ''The retardation of aging in mice by dietary restriction: longevity, cancer, immunity and lifetime energy intake.'' (Journal of Nutrition, 116(4), pages 641-54.,April, 1986.)

External links -

unsystem.org - UN Standing Committee on Nutrition - In English, French and Portuguese

nal.usda.gov - USDA Frequently asked questions

!outside.utsouthwestern.edu - Texas University: A review of current nutrition academic articles

!nutritional-supplements-direct ory.com - Nutrition and Nutritional Supplements Information

nal.usda.gov - Department of Agriculture's Food and Nutrition Information Center.

7nutrition.co.uk - Nutrition Dictionary

nismat.org - Nutrition advice for sports people from Nicholas Institute for Sports Medicine and Trauma

code-interactive.com - Personalized Online Health Profile

agr.gc.ca - Agriculture & Agri-Food Canada

ifpri.org - International Food Policy Research Institute

foodfileonline.com - Food File Online Nutrition information for thousands of food products

iodinenetwork.net - Network for Sustained Elimination of Iodine Deficiency

Disclaimer - Please remember that Wikipedia is offered for informational use only. The information is in most cases not reviewed by professionals. You are advised to contact your doctor for health-related !decisions.''Category:HealthCat egory:Nutritionbg:Хl 8;анен еda:Ernæringde:Ernähru nges:nutricióneo:Nutradofr:Nu tritionfi:ravintoja:栄&# 39178;学lb:Ernierungpt:n utriçãosr:Ис 93;рана ;zh:营养学

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Metabolix produces premium products and services to assist individuals, corporations and athletes achieve their goals.
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Burns Pet Nutrition
Veterinary advice from John Burns BVMS MRCVS and a complete natural food for dogs and cats of all ages, together with a Guide to Natural Health Care
http://www.burns-pet-nutrition.co.uk/

CoreyEnterprises.com
Small business advertising and marketing, nutrition and fitness products, divination and natural healing products
http://www.wesingmusic.com/

The Office of Dr. Jamileh Naddaf
Dr. Naddaf combines state-of-the-art technology with natural Eastern and Western treatment procedures to achieve non-invasive, optimal results for her patients. She has an enviable record in treating the difficult cases - cases that are hard to diagnose, treat or manage. Health Solutions represents clarity and results. Dr. Naddaf specializes in solving health problems that have been hard to solve. She accomplishes this routinely by using an extremely personalized and targeted approach to each individual patient. In this way, guesswork is removed, time is saved, and money is well-spent.
http://www.healthsolutionssource.com/

Dairy Council of California
Free nutrition education lessons and materials for California teachers and health professionals
http://www.dairycouncilofca.org/

Agape Nutrition
A site offering professional nutritional products grouped by usage.
http://www.agapenutrition.com/

The Nutrition and Food Web Archive
Provides free general nutrition, clinical nutrition, and food resources for educators, dietitians, and students.
http://www.nafwa.org

Natural Nutritional Supplements
Super Veggies - Encapsulated, organic,100% pure, sprout based supplements. Help meet Vegetable Quotients fight cholesterol, cancer, fatigue, diabetes, appetite, diabetes, arthritis.
http://www.iq-lab.com/

Nutrition Navigator
Experts at Tufts University review and rank nutrition websites. Search by keyword or browse by audience or topic category.
http://navigator.tufts.edu

National Agricultural Library
Research affiliation: Association of Research Libraries.
http://www.nal.usda.gov/

Nutrition.org
Publication from the American Academy of Nutritional Sciences. Includes past and current issues online with subscription information.
http://www.nutrition.org/

Nutrition.Gov
A new federal resource providing accurate scientific information on nutrition and dietary guidance for the public.
http://www.nutrition.gov