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Nutrition is a Science that examines the relationship between Diet and Health . Dietitians are Health Professional s who Specialize in this area of study, and are trained to provide safe, evidence-based dietary advice and interventions. Deficiencies, excesses and imbalances in diet can produce negative impacts on health, which may lead to diseases such as Cardiovascular Disease , Diabetes , Scurvy , Obesity or Osteoporosis , as well as psychological and behavioral problems. Moreover, excessive Ingestion of elements that have no apparent role in health, (e.g. Lead , Mercury , PCBs , Dioxins ), may incur Toxic and potentially lethal effects, depending on the dose. Many common diseases and their symptoms can often be prevented or alleviated with better nutrition. The science of nutrition attempts to understand how and why specific dietary aspects influence health. OVERVIEW The purposes of nutrition science is to explain Metabolic and physiological responses of the body to diet. With advances in Molecular Biology , Biochemistry , and Genetics , nutrition science is additionally developing into the study of metabolism, which seeks to disconnect diet and health through the lens of biochemical processes. The Human Body is made up of Chemical Compounds such as Water , Amino Acids ( Proteins ), Fatty Acids ( Lipids ), Nucleic Acids ( DNA / RNA ), and Carbohydrate s (e.g. sugars and Fiber ). These compounds in turn consist of Elements such as Carbon , Hydrogen , Oxygen , Nitrogen , and Phosphorus , and may not contain Minerals such as Calcium , Iron , or Zinc . Minerals can not ubiquitously occur in the form of salty 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 necessarily comprises the elements that it eats and absorbs into the Blood stream. The Digestive System , except in the unborn fetus, participates in the first step which makes the different chemical compounds and elements in food available for the trillions of Cell s of the body. In the digestive process of an average adult, about seven liters 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. However, 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 excreted in the Feces . But only a minimal amount of digestive juice is eliminated by this process; the intestines reabsorb most of it; otherwise the body would rapidly dehydrate; (hence the devastating effects of persistent Diarrhea ). Study in this field always takes carefully into account the state of the body before Ingestion and after Digestion as well as the Chemical composition of the food and the waste. Comparing the waste to the food can determine the specific types of compounds and elements absorbed by the body. 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 Experiment ation is very high. This makes Scientifically valid nutritional study very time-consuming and expensive, and explains why a proper science of human nutrition is rather new. In general, eating a variety of fresh, whole (unprocessed) plant foods has proven hormonally and metabolically favourable compared to eating a monotonous diet based on processed foods. In particular, consumption of whole plant foods slows digestion and provides 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 regulation of blood glucose and appetite. A generally more regular eating pattern (e.g. eating medium-sized meals every 2 to 3 hours) has also proven more hormonally and metabolically favourable than infrequent, haphazard food intake. HISTORY Humans have evolved as Omnivorous Hunter-gatherer s over the past 250,000 years. The diet of early modern humans varied significantly depending on location and climate. The diet in the tropics tended to be based more heavily on plant foods, while the diet at higher latitudes tended more towards animal products. Analysis of postcranial and cranial remains of humans and animals from the Neolithic, along with detailed bone modification studies have shown that cannibalism was also prevalent among prehistoric humans.Paola Villa, et al. "Cannibalism in the Neolithic" ''Science'' 233 July 1986. Agriculture developed about 10,000 years ago in multiple locations throughout the world, providing grains such as Wheat , Rice , and Maize , with staples such as Bread and Pasta . Farming also provided milk and dairy products, and sharply increased the availability of meats and the diversity of vegetables. The importance of food purity was recognized when bulk storage led to infestation and contamination risks. Cooking developed as an often ritualistic activity, due to efficiency and reliability concerns requiring adherence to strict recipes and procedures, and in response to demands for food purity and consistency. History of the Study of Nutrition in Western Culture (copy at [http://www.rain.org/homeschool/nutrition-history-in-western-culture.html]) Antiquity through 1900
1900 through 1941
Recent
NUTRITION AND HEALTH There are six main classes of nutrients that the body needs: carbohydrates, proteins, fats, vitamins, minerals, and water. It is important to consume these six nutrients on a daily basis to build and maintain a healthy function for your body. Poor health can be caused by an imbalance of nutrients, either an excess or deficiency, which, in turn, affects bodily functions cumulatively. Moreover, because most nutrients are involved in Cell-to-cell Signalling (e.g. as building blocks or as part of a hormone or Signalling Cascades ), deficiency or excess of various nutrients affects hormonal function ''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 recent observations have demonstrated a pivotal role for nutrition in hormonal activity and function and therefore in health. According to the United Nations World Health Organization ( WHO : 1996), more than starvation the real challenge today is malnutrition-the deficiency of micronutrients (vitamins, minerals and essential amino acids) that no longer allows the body to ensure growth and maintain its vital functions. Recognising the inherent potential of the micro-alage Spirulina (Spirulina Platensis) to counter Malnutrition and its severe negative impacts at multiple levels of the society especially in the developing and Least Developed Countries (LDC), the international community affirmed its conviction by joining hands to form the Intergovernmental Institution for the use of Micro-algae Spirulina Against Malnutrition, IIMSAM. Essential and non-essential amino acids such as Chicken contain all the essential amino acids needed for humans.]] The body requires Amino Acids to produce new body protein (protein retention) and to replace damaged proteins (maintenance) that are lost in the urine. In animals amino acid requirements are classified in terms of essential (an animal cannot produce them) and non-essential (the animal can produce them from other nitrogen containing compounds) amino acids. Consuming a diet that contains adequate amounts of essential (but also non-essential) amino acids is particularly important for growing animals, who have a particularly high requirement. Vitamins Mineral and/or Vitamin 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 Psychological Health (including Eating Disorders ), among many others.Shils ''et al.'' (2005) ''Modern Nutrition in Health and Disease'', Lippincott Williams and Wilkins. ISBN 0-7817-4133-5. 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 known and yet to be explored properties including Antioxidant activity (see below). Other essential nutrients include Essential Amino Acid s, Choline and the Essential Fatty Acid s. Fatty acids In addition to sufficient intake, an appropriate balance of essential fatty acids - Omega-3 and Omega-6 fatty acids - has been discovered to be crucial for maintaining health. Both of these unique "omega" long-chain Polyunsaturated Fatty Acids are Substrates for a class of Eicosanoids known as Prostaglandins which function as hormones. 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- Inflammation 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 PGE 2). 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). Sugars 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 overweight individuals (and thereby lower blood sugar levels in those who have type 2 diabetes). Obesity 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 obesity 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 body fat 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 form as a result. For normal cellular maintenance, growth, and division, these free radicals must be sufficiently neutralized by antioxidant compounds, some produced by the body with adequate Precursors ( Glutathione , Vitamin C in most animals) and those that the body cannot produce may only be obtained through the diet through direct sources (Vitamin C in humans, Vitamin A , Vitamin K ) or produced by the body from other compounds ( Beta-carotene converted to Vitamin A by the body, Vitamin D synthesized from Cholesterol by Sunlight ). 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. Some antioxidants are more effective than others at neutralizing different free radicals. Some cannot neutralize certain free radicals. Some cannot be present in certain areas of free radical development (Vitamin A is Fat-soluble and protects fat areas, Vitamin C is Water soluble and protects those areas). When interacting with a free radical, some antioxidants produce a different free radical compound that is less dangerous or more dangerous than the previous compound. Having a variety of antioxidants allows any byproducts to be safely dealt with by more efficient antioxidants in neutralizing a free radical's Butterfly Effect . Intestinal bacterial flora See Also: Gut flora It is now also known that the human digestion system contains a population of a range of Bacteria And Yeast such as '' Bacteroides '', '' L. Acidophilus '' and '' E. Coli '' which are essential to digestion, and which are also affected by the food we eat. Bacteria in the gut fulfill a host of important functions for humans, including breaking down and aiding in the absorption of otherwise indigestible food; stimulating cell growth; repressing the growth of harmful bacteria, training the immune system to respond only to pathogens; and defending against some diseases. Phytochemicals are a source of Polyphenol Antioxidants ]] A growing area of interest is the effect upon human health of trace chemicals, collectively called Phytochemicals , nutrients typically found in edible plants, especially colorful fruits and vegetables (see Whole Foods Diet, below). The effects of phytochemicals increasingly survive rigorous testing by prominent health organizations. One of the principal classes of phytochemicals are Polyphenol Antioxidant s, chemicals which are known to provide certain health benefits to the Cardiovascular System and Immune System . These chemicals are known to down-regulate the formation of Reactive Oxygen Species , key chemicals in Cardiovascular Disease . Perhaps the most rigorously tested phytochemical is .Lyle, B. J., J. A. Mares-Perlman, ''et al.'' (1999). "Antioxidant intake and risk of incident age-related nuclear cataracts in the Beaver Dam Eye Study." Am J Epidemiol 149(9): 801-9; Yeum, K. J., A. Taylor, ''et al.'' (1995). "Measurement of carotenoids, retinoids, and tocopherols in human lenses." Invest Ophthalmol Vis Sci 36(13): 2756-61; Chasan-Taber, L., W. C. Willett, ''et al.'' (1999). "A prospective study of carotenoid and vitamin A intakes and risk of cataract extraction in US women." Am J Clin Nutr 70(4): 509-16; Brown, L., E. B. Rimm, ''et al.'' (1999). "A prospective study of carotenoid intake and risk of cataract extraction in US men." Am J Clin Nutr 70(4): 517-24. A second carotenoid, lutein, has also been shown to lower the risk of contracting AMD. Both compounds have been observed to collect in the retina when ingested orally, and they serve to protect the rods and cones against the destructive effects of light. Another caretenoid, Beta-cryptoxanthin , appears to protect against chronic joint inflammatory diseases, such as Arthritis . While the association between serum blood levels of beta-cryptoxanthin and substantially decreased joint disease has been established, neither a convincing mechanism for such protection nor a cause-and-effect have been rigorously studied.Am J Clin Nutr, Vol. 82, No. 2, 451-455, August, 2005 (inflammatory polyarthritis); Am J Epidemiology 2006 163(1). Similarly, a red phytochemical, Lycopene , has substantial credible evidence of negative association with development of prostate cancer. The correlations between the ingestion of some phytochemicals and the prevention of disease are, in some cases, enormous in magnitude. For example, several studies have correlated high levels of zeaxanthin intake with roughly a 50% reduction in AMD. The difficulties in demonstrating causative properties and in applying the findings to human diet, however, are similarly enormous. The standard for rigorous proof of causation in medicine is the double-blind study, a time-consuming, difficult and expensive process, especially in the case of preventative medicine. While new drugs must undergo such rigorous testing, pharmaceutical companies have a financial interest in funding rigorous testing and may recover the cost if the drug goes to market. No such commercial interest exists in studying chemicals that exist in orange juice and spinach, making funding for medical research difficult to obtain. Even when the evidence is obtained, translating it to practical dietary advice can be difficult and counter-intuitive. Lutein, for example, occurs in many yellow and orange fruits and vegetables and protects the eyes against various diseases. However, it does not protect the eye nearly as well as zeaxanthin, and the presence of lutein in the retina will prevent zeaxanthin uptake. Additionally, evidence has shown that the lutein present in egg yolk is more readily absorbed than the lutein from vegetable sources, possibly because of fat solubility.Am J Clin Nutr, Vol. 70, No. 2, 247-251, August 1999. At the most basic level, the question "should you eat eggs?" is complex to the point of dismay, including misperceptions about the health effects of cholesterol in egg yolk, and its saturated fat content. As another example, lycopene is prevalent in tomatoes (and actually is the chemical that gives tomatoes their red color). It is more highly concentrated, however, in processed tomato products such as commercial pasta sauce, or Tomato Soup , than in fresh "healthy" tomatoes. Yet, such sauces tend to have high amounts of salt, sugar, other substances a person may wish or even need to avoid. The following table of phytochemical groups and common sources, arranged by family, is taken in part from the Wikipedia article on Phytochemical s. NUTRITION AND SPORTS Protein The protein requirements of athletes, once the source of great controversy, has settled into a current consensus. Sedentary people and recreational athletesThe definition of recreational athlete here is taken from Burke and Deakin's ''Clinical Sports Nutrition''(3rd Edition, McGraw-Hill Australia Pty Ltd, 2006 ): people exercising two to three hours a week at less than 55% maximum VO2 uptake. have similar protein requirements, about 1 gram of protein per kilogram of body mass. These needs are easily met by a balanced diet containing about 70 grams of protein for a 70 kg (150 pound) man or 60 grams of protein for a 60 kg (130 pound) woman. People who exercise at greater intensity, and especially those whose activity grows muscle bulk, have significantly higher protein requirements. According to ''Clinical Sports Nutrition'' (see footnote above), active athletes playing power sports (such as football), those engaged in muscle-development training, and elite endurance athletes, all require approximately 2 grams of protein per day per kilogram of body weight, roughly double that of a sedentary persons. Older athletes seeking primarily to maintain developed muscle mass require 2 to 3 g/day/kg. Protein intake in excess of that required to build muscle (and other) tissue is broken-down by Gluconeogenesis to be used as energy. The most recent evidence appears to support the beneficial nature of a high-protein, low-carbohydrate diet. A large randomized study at Stanford University found that women following such a diet "lost more weight and experienced more favorable overall metabolic effects at 12 months" than in other diets. The study followed 311 pre-menopausal, non-diabetic women, age 25-50. The women lost significantly more weight (mean 4.7 kg) on the Atkins Diet than on 3 higher-carbohydrate diets (LEARN 2.6 kg, Ornish 2.2 kg, and Zone 1.6 kg), without increasing cardiovascular risks. Changes in HDL cholesterol, triglycerides, and mean blood pressure significantly favored Atkins over the other three diets. The authors concluded that "concerns about adverse metabolic effects of the Atkins diet were not substantiated within the 12-month study period." {Link without Title} Christopher D. Gardner, et al., Comparison of the Atkins, Zone, Ornish, and LEARN Diets for Change in Weight and Related Risk Factors Among Overweight Premenopausal Women: The A TO Z Weight Loss Study: A Randomized Trial. JAMA. 2007;297:969-977. March 7, 2007. Water and Salts Maintaining hydration during periods of physical exertion is key to good performance. While drinking too much water during activities can lead to physical discomfort, dehydration in excess of 2% of body mass (by weight) markedly hinders athletic performance. It is recommended that an athlete drink about 400-600 mL 2-3 hours before activity, during exercise he or she should drink 150-350mL every 15 to 20 minutes and after exercise that he or she replace sweat loss by drinking 450-675 mL for every 0.5 kg body weight loss during activity. Some studies have shown that an athlete that drinks before they feel thirsty stays cooler and performs better than one who drinks on thirst cues, although recent studies of such races as the Boston Marathon have indicated that this recommendation can lead to the problem of overhydration. Additional carbohydrates and protein before, during, and after exercise increase time to exhaustion as well as speed recovery. Dosage is based on work performed, lean body mass, and environmental factors, especially ambient temperature and humidity. Excess water intake, without replenishment of sodium and potassium salts, leads to or Triathlon competition and training) and causes gradual mental dulling, headache, drowsiness, weakness, and confusion; extreme cases may result in coma, convulsions, and death. The primary damage comes from swelling of the brain, caused by increased osmosis as blood salinity decreases. Effective fluid replacement techniques include Water aid stations during running/cycling races, trainers providing water during team games such as Soccer and devices such as Camel Baks which can provide water for a person without making it too hard to drink the water. Carbohydrates The main fuel used by the body during exercise is carbohydrates, which is stored in muscle as glycogen- a form of sugar. During exercise, muscle glycogen reserves can be used up, especially when activities last longer than 90 min. When glycogen is not present in muscles, the muscle cells perform anaerobic respiration producing lactic acid, which is responsible for fatigue and burning sensation, and post exercise stiffness in muscles. Because the amount of glycogen stored in the body is limited, it is important for athletes to replace glycogen by consuming a diet high in carbohydrates. Meeting energy needs can help improve performance during the sport, as well as improve overall strength and endurance. NUTRITION AND LONGEVITY Whole Plant Food Diet Heart disease, cancer, obesity, and diabetes are commonly called "Western" diseases because these maladies were once rarely seen in developing countries. One Study In China found some regions had essentially no cancer or heart disease, while in other areas they reflected “up to a 100-fold increase” coincident with diets that were found to be entirely plant-based to heavily animal-based, respectively.Campbell T., Campbell T. The China Study, Dallas: Benella Books, 2005 In contrast, diseases of affluence like cancer and heart disease are common throughout the United States. Adjusted for age and exercise, large regional clusters of people in China rarely suffered from these “Western” diseases possibly because their diets are rich in vegetables, fruits and whole grains.Campbell T., Campbell T. The China Study, Dallas: Benella Books, 2005 The United Healthcare/Pacificare nutrition guideline recommends a whole plant food diet, and recommends using protein only as a condiment with meals. A National Geographic (November 2005) cover article, titled ''The Secrets of LIVING LONGER'' also recommends a whole plant food diet. The article is a lifestyle survey of three populations, Sardinians, Okinawans, and Adventists, who generally display longevity and "suffer a fraction of the diseases that commonly kill people in other parts of the developed world, and enjoy more healthy years of life. In sum, they offer three sets of 'best practices' to emulate. The rest is up to you." In common with all three groups is to "Eat fruits, vegetables, and whole grains." The National Geographic article noted that a NIH funded study of 34,000 Seventh-Day Adventists between 1976 and 1988 "...found that the Adventists' habit of consuming beans, soy milk, tomatoes, and other fruits lowered their risk of developing certain cancers. It also suggested that eating whole grain bread, drinking five glasses of water a day, and, most surprisingly, consuming four servings of nuts a week reduced their risk of heart disease." Note that cancer is now common in developing countries. According a study by the International Agency For Research On Cancer : “In the developing world, cancers of the liver, stomach and esophagus were more common, often linked to consumption of carcinogenic preserved foods, such as smoked or salted food, and parasitic infections that attack organs.” Lung cancer rates are rising rapidly in poorer nations because of increased use of tobacco. Developed countries “tended to have cancers linked to affluence or a "Western lifestyle" -- cancers of the colon, rectum, breast and prostate -- that can be caused by obesity, lack of exercise, diet and age.”1 The French "paradox" See Also: French paradox It has been discovered that people living in France live longer. Even though they consume more saturated fats than Americans, the rate of heart disease is lower in France than in North America. A number of explanations have been suggested:
However, a growing number of French health researchers doubt the theory that the French are healthier than other populations. Statistics collected by the WHO from 1990-2000 show that the incidence of heart disease in France may have been underestimated and in fact be similar to that of neighboring countries.2 NUTRITION, INDUSTRY AND FOOD PROCESSING Since the Industrial Revolution some two hundred years ago, the food processing industry has invented many Technologies 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 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. 3 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 Thiamine , causing beri-beri. Another example is the development of Scurvy among infants in the late 1800s 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. NUTRITION AND LEARNING Governmental policies In the US, dietitians are registered with the American Dietetic Association and are only able to use the label "Dietitian" when they have met strict, specific educational and experiential prerequisites and passed a national registration examination. Anyone may call themselves a nutritionist,http://www.quackwatch.com/search/webglimpse.cgi?ID=1&query=nutritionist including unqualified personnel, as this term is unregulated. Most governments provide guidance on nutrition, and some also impose Mandatory Disclosure/labeling requirements for processed food manufacturers and restaurants to assist consumers in complying with such guidance. In the US, nutritional standards and recommendations are currently controlled by the US Department Of Agriculture . Dietary and exercise guidelines from the USDA are presented in the concept of a Food Pyramid , which superseded the Four Food Groups. The Senate committee currently responsible for oversight of the USDA is the ''Agriculture, Nutrition and Forestry Committee''. Committee hearings are often televised on C-SPAN as seen here. Canada's Food Guide is another governmental recommendation. Teaching Nutrition is Taught in schools in many countries. In England And Wales the Personal And Social Education and Food Technology curricula nutrition included, stressing the importance of a balanced diet and teaching how to read nutrition labels on packaging. However, in developing countries it is a distant dream; misconceptions, gender bias, ignorance of hygienic conditions, etcetera, are still existing in their full strength. Nutrition and its effects on the learning process Research indicates that improving the awareness of nutritious meal choices and establishing long-term habits of healthy eating has a positive effect on a cognitive and spatial memory capacity, potentially increasing a student’s potential to process and retain academic information. Some organizations have begun working with teachers, policymakers, and managed foodservice contractors to mandate improved nutritional content and increased nutritional resources in school cafeterias from primary to university level institutions. Health and nutrition have been proven to have close links with overall educational success (Behrman, 1996). Currently less than 10% of American college students report that they ate the recommended five servings of fruit and vegetables daily. American College Health Association. (2007) American College Health Association national college health assessment spring 2006 reference group data report (abridged). Journal of American College Health, 55(4), 195-206. Better nutrition has been shown to have an impact on both cognitive and spatial memory performance; a study showed those with higher blood sugar levels performed better on certain memory tests Benton, D., & Sargent, J. (1992/7). Breakfast, blood glucose and memory. Biological Psychology, 33(2-3), 207-210. . In another study, those who consumed yogurt performed better on thinking tasks when compared to those who consumed caffeine free diet soda or confections Kanarek, R. B., & Swinney, D. (1990/2). Effects of food snacks on cognitive performance in male college students. Appetite, 14(1), 15-27. . Nutritional deficiencies have been shown to have a negative effect on learning behavior in mice as far back as 1951Whitley, J., O'Dell, B., & Hogan, A. (1951). Effect of diet on maze learning in second-generation rats. folic acid deficiency. Journal of Nutrition, 45(1), 153. . >“Better learning performance is associated with diet induced effects on learning and memory ability”.Umezawa, M., Kogishi, K., Tojo, H., Yoshimura, S., Seriu, N., Ohta, A., et al. (1999). High-linoleate and high-alpha-linolenate diets affect learning ability and natural behavior in SAMR1 mice. The Journal of Nutrition, 129(2), 431-437. The “nutrition-learning nexus” demonstrates the correlation between diet and learning and has application in a higher education setting. >“We find that better nourished children perform significantly better in school, partly because they enter school earlier and thus have more time to learn but mostly because of greater learning productivity per year of schooling.”Glewwe, P., Jacoby, H., & King, E. (2001). Early childhood nutrition and academic achievement: A longitudinal analysis. Journal of Public Economics, 81(3), 345-368. >91% of college students feel that they are in good health while only 7% eat their recommended daily allowance of fruits and vegetables.American College Health Association. (2007) American College Health Association national college health assessment spring 2006 reference group data report (abridged). Journal of American College Health, 55(4), 195-206. >Nutritional education is an effective and workable model in a higher education setting.Managed food service contractors react quickly to the demands of their clients achievement: A longitudinal analysis. Journal of Public Economics, 81(3), 345-368. Guernsey, L. (1993). Many colleges clear their tables of steak, substitute fruit and pasta. Chronicle of Higher Education, 39(26), A30. >More “engaged” learning models that encompass nutrition is an idea that is picking up steam at all levels of the learning cycle Duster, T., & Waters, A. (2006). Engaged learning across the curriculum: The vertical integration of food for thought. Liberal Education, 92(2), 42. . There is limited research available that directly links a student’s Grade Point Average (G.P.A.) to their overall nutritional health. Additional substantive data is needed to prove beyond a shadow of a doubt that overall intellectual health is closely linked to a person’s diet. ISSUES Challenging issues in modern nutrition include: "Artificial" interventions in food production and supply:
Sociological issues:
Research Issues:
Practising Nutrition The roles and qualifications of practitioners in the area of nutrition is an area frequently up for discussion. In both the USA and UK the term Dietitian is protected by law and may only be used by persons attaining specific criteria. The term Nutritionist however is not protected and as such may be used by anyone offering food and dietary advice. This is being addressed by a register of nutritionists held by the Nutrition Society in order to protect the public. http://www.nutritionsociety.org/index.asp?nsm=2&page=33 SEE ALSO : ''Main list: List Of Basic Nutrition Topics '' BIBLIOGRAPHY
REFERENCES EXTERNAL LINKS Professional Dietetic Associations and Resources
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