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This piglix contains articles or sub-piglix about Nutrition
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Nutrition in Classical Antiquity


Antiquity is referred to as the time period before the Middle Ages which began around 500A.D. The major civilizations are those of the Mediterranean region, ancient Greece, ancient Rome, and southwest Asia. Nutrition consisted of simple fresh whole foods that were either locally grown or transported from neighboring towns during times of crisis. Physicians and philosophers studied the effect of food on the human body and they generally agreed that food was important in preventing illness and restoring health.

People ate various types of food, consumers had choices from dairy (milk and cheese), fruits (figs, pears, apples, and pomegranates), vegetables (greens and bulbs), Grains and legumes (cereal, wheat barley, millet, beans, and chickpeas), and meat (beef, mutton, fowl, muscles, and oysters). Food was most often fresh, but the processing of food aided in the preservation for long term storage or transport to other cities. Cereals, olives, wine, legumes, vegetables, fruit, and animal products could all be processed and stored for later use. Cereals were often processed and stored in the form of bread, flat-cakes, and porridge. Legumes were also most often processed and stored as pulses and eaten with bread to enhance the flavor. Cereals were most nourishing providing essential macro- and micronutrients to consumers. Cereals sustained individuals with sufficient amounts of protein, vitamin B, vitamin E, calcium, and iron. Fruits and vegetables provided vitamin A, vitamin C, vitamin D, and half the dietary fiber needed for health support.

Cities depended on trade with agricultural farmers and neighboring cities for food supply due to the lack of land cultivation area. Food supply was altered by numerous events such as climate, location, and distribution. Weather drastically affected the amount of produce harvested during a growing season. Climate often fluctuated in the Mediterranean region with varying temperatures and volumes of precipitation; these two factors also affected the quality of soil available to farmers. Soil composition mainly depended on location, but the climate affected the moisture retained within the soil. If the growing season was not prosperous then cities would have to resort to trade as a means for food supply. This often made food distribution difficult due to political disagreements and issues with transportation. To combat hunger due to inadequate food supply people would eat twigs, roots of plants, bark from trees, and each other as a last resort. Food shortages were frequent but didn’t last long enough to generate famine.

Pythagoras (570 BC – 495 BC) was a Greek philosopher, mathematician, and is also considered to be “the Father of Ethical Vegetarianism”. He believed that in order to obtain the highest level of spiritual and physical health it was necessary to follow a lifestyle that included a vegetarian diet which excluded meats and other flesh foods.Anaxagoras (500 BC – 428 BC) was also a Greek philosopher, he suggested that foods that we ate contained fragments that were needed for growth in the body. His belief was that “everything is in everything, at all times”, physical characteristics (hair, nails, flesh, ect.) were generated from foods that contained those same substances.Hippocrates (460 BC – 377 BC) was a physician known as the “father of medicine”, his nutritional advice was based on the presence of the four humors in the body.Plato (428/427 BC – 348/347 BC) was a Greek philosopher and mathematician; his idea of a healthy diet consisted of balance and moderation of cereals, fruits, vegetables, dairy, with a strong emphasis on the moderation of meat and wine. His belief is that excess food from one source would lead to future ailments. Galen (129 AD – 216 AD) built much of his work by challenging the writings of others. He was an admirer of Hippocrates because of the work he had done in the field of medicine. Galen believed that Hippocrates had stated all that needed to be known about nutrition, and he would interpret his work by the presentation of his own knowledge.



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Nutrition physiology


Nutrition physiology deals with different types of food and their effects on the metabolism. One topic of nutrition physiology is vitamin loss of frozen foods. Another topic is the calculation of required calories per day and what sort of food should best be avoided for a healthy lifestyle. This can be looked at as the driving viewpoint of nutritional research that guides health and food policy today. Yet another topic in this expanding field is the direct regulating effects of dietary vitamins and minerals on cell gene expression, or epigenetics. The direct and specific effect of nutrients from the diet on cell physiology is a growing field with many unknowns still existing. A current struggle in this research is the ability to evaluate the effects of varying metabolite concentrations on cell function, while keeping all else constant. The dietary nutrient ratios that produce optimal physiological output is a topic that could produce many solutions to problems such as cancer regulation, individualized sport performance, and much more.




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Nutrition psychology


Nutrition psychology (NP) is the psychological study of how cognitive choices, such as meal decisions, influence nutrition, psychological health, and overall health. Nutrition psychology seeks to understand the relationship between nutritional behavior and mental health/well-being. NP is a sub-field of psychology and more specifically of health psychology. It may be applied to numerous different fields including: psychology, dietetics, nutrition, and marketing. NP is a fairly new field with a brief history that has already started to contribute information and knowledge to psychology. There are two main areas of controversy within nutrition psychology. The first area of controversy is that the topic can be viewed as nutrition affecting psychological functions or can be viewed as psychological choices and behavior influencing nutrition and health. The second controversy being the defining of what is "healthy" or "normal" as related to nutrition.

Nutrition is defined as "the act or process of nourishing or being nourished; specifically: the sum of the processes by which an animal or plant takes in and utilizes food substances" and psychology is defined as "the study of mind and behavior in relation to a particular field of knowledge or activity," in this case the particular field is nutrition. Therefore, nutrition psychology is the study of mind and behavior in relation to the process of taking in and utilizing food.

Today, over one third of American adults are considered "obese" and nutrition psychology aims to explain what psychological reasons may be behind this and other health trends. Nutrition psychology looks at the internal psychological effects of why people do what they do, and how they are shaped and influenced by outside stimuli.

Nutrition psychology is a field that is still in its early stages of development. With obesity a continually growing problem in the United States and abroad, nutrition psychology is gaining importance and popularity in society today. As it has grown, nutrition psychology has directly and indirectly influenced research on dieting, food labels, the way food is marketed, food technology, obesity, and the attitude of the public towards food, among other topics.



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Nutrition scale


A Nutrition scale is a weighing instrument that output precise nutritional information for foods or liquids. Most scales calculate calories, carbohydrates, and fats, with more sophisticated scales calculating additional nutrients such as Vitamin K, potassium, magnesium, and sodium.

Scales often use USDA information on food to ensure accuracy. The products are used primarily as a weight management tool, but have found a user base with diabetics and hypertensive people.



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Nutrition transition


Nutrition transition is the shift in dietary consumption and energy expenditure that coincides with economic, demographic, and epidemiological changes. Specifically the term is used for the transition of developing countries from traditional diets high in cereal and fiber to more Western pattern diets high in sugars, fat, and animal-source food.

The nutrition transition model was first proposed in 1993 by Barry Popkin, and is the most cited framework in literature regarding the nutrition transition, although it has been subject to some criticism for being overly simplified. Popkin posits that two other historic transitions affect and are affected by nutritional transition. The first is the demographic transition, whereby a pattern of high fertility and high mortality transforms to one of low fertility and low mortality. Secondly, an epidemiological transition occurs, wherein a shift from a pattern of high prevalence of infectious diseases associated with malnutrition, and with periodic famine and poor environmental sanitation, to a pattern of high prevalence of chronic and degenerative diseases associated with urban-industrial lifestyles is shown. These concurrent and dynamically influenced transitions share an emphasis on the ways in which populations move from one pattern to the next. Popkin used five broad patterns to help summarize the nutrition transition model. While these patterns largely appear chronological, it is important to note that they are not restricted to certain periods of human history and still characterize certain geographic and socioeconomic subpopulations. The first pattern is that of collecting food, a characterization of hunter-gatherers, whose diets were high in carbohydrates and low in fat, especially saturated fat. The second pattern is defined by famine, a marked scarcity and reduced variation of the food supply. The third pattern is one of receding famine. Fruits, vegetables, and animal protein consumption increases, and starchy staples become less important in the diet. The fourth pattern is one of degenerative diseases onset by a diet high in total fat, cholesterol, sugar, and other refined carbohydrates and low in polyunsaturated fatty acids and fiber. This pattern is often accompanied by an increasingly sedentary lifestyle. The fifth pattern, and most recently emerging pattern, is characterized by a behavioral change reflective of a desire to prevent or delay degenerative diseases. Recent and rapid changes seen in developing countries from the second and third pattern to the fourth is the common focus of nutrition transition research and desire for policy that would emphasize a healthier overall diet characterizes the shift from the fourth to the fifth pattern.



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Nutritional anthropology


Nutritional anthropology is the interplay between human biology, economic systems, nutritional status and food security, and how changes in the former affect the latter. If economic and environmental changes in a community affect access to food, food security, and dietary health, then this interplay between culture and biology is in turn connected to broader historical and economic trends associated with globalization. Nutritional status affects overall health status, work performance potential, and the overall potential for economic development (either in terms of human development or traditional western models) for any given group of people.

Most scholars construe economy as involving the production, distribution, and consumption of goods and services within and between societies. A key concept in a broad study of economies (versus a particular econometric study of commodities and stock markets) is social relations. For instance, many economic anthropologists state that the gift exchange, competitive gift exchange, and impersonal market exchange are all reflective of dominant paradigms of social relations within a given society. The main forms of economy extant around most of the world today, in terms of a simple production, distribution, consumption model, are subsistence based and market economies. Subsistence refers to production and consumption on a small-scale of the household or community, while a market-based economy implies a much broader scale of production, distribution, and consumption. A market economy also entails the exchange of goods for currency, versus bartering commodities or being under continuing reciprocal gift exchange obligations. This is not to say that market economies do not coexist with subsistence economies and other forms, but that one type usually dominates within a given society. However, a broad array of scholarship exists, stating that market economies are rapidly increasing in importance on a global scale, even in societies that have traditionally relied much more heavily on subsistence production. This economic shift has nutritional implications that this entry will explore further.

The most important step in understanding the links between economics and nutrition is to understand major modes of production that societies have used to produce the goods (and services) they have needed throughout human history; these modes are foraging, shifting cultivation, pastoralism, agriculture, and industrialism (Park 2006).



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Nutritional epidemiology


Nutritional epidemiology is a relatively new field of medical research that studies the relationship between nutrition and health. Diet and physical activity are difficult to measure accurately, which may partly explain why nutrition has received less attention than other risk factors for disease in epidemiology.



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Nutritional gatekeeper


Nutritional gatekeeper has been used to refer to the person in a household who typically makes the purchasing and preparation decisions related to food. Nutritional gatekeepers can be a parent, grandparent, sibling, or caregiver. Traditionally a role played by women, today the role of nutritional gatekeeper is not part of any gender role.

The concept of the nutritional gatekeeper was first suggested by Kurt Lewin in 1943. Before that time, most past efforts to study nutrition education had focused on the individuals eating the food.

Based on Lewin’s research, food reaches the household through “channels” such as grocery store, the garden, and the refrigerator. The selection of the channels and the food that passes through them is under control of the gatekeeper.

For sixty-five years since Lewin’s work, many dietetics and nutrition textbooks have referred, in the discussions of children’s and adolescents’ dietary habits, to the gatekeeper role played by women.

A home’s nutritional gatekeeper usually has the biggest food influence in the nutrition life of most people. They are the biggest food influence in the lives of their children as well as in the life of their spouse or partner. Regardless of the gatekeeper’s sex or age and regardless of whether they are a great cook or whether they are "culinarily challenged", the gatekeeper has a huge day-to-day influence on his or her family’s nutrition.

An average of 72% of what and how much children eat is estimated to be either directly or indirectly determined by these nutritional gatekeepers. In addition, the gatekeeper has a direct and an indirect impact on what the children eat outside the home. This happens every time they make their children’s lunches and every time they give them enough money to afford whatever lunch or snack they want. They also influence the restaurant orders of their family by what they recommend or order themselves.

It has been demonstrated that children without regular family dinners ate sweets and fast foods more often, and had more behavioral problems than those having regular family dinners.

Gatekeeper research starting in the 1940s suggests that the cooks are also responsible for nutrition. Cooking family dinners can expand the nutritional gatekeeper's influence. Eating family dinner has been associated with healthful dietary patterns, better fruit and vegetable intake, lower intake of fried food and soda. Cooks are not only gatekeepers, but opinion leaders as well.



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Nutritional genomics


Nutritional genomics is a science studying the relationship between human genome, nutrition and health.

It can be divided into two disciplines:

97% of the genes known to be associated with human diseases result in monogenic diseases, i.e. a mutation in one gene is sufficient to cause the disease. Modifying the dietary intake can prevent some monogenic diseases. One example is phenylketonuria, a genetic disease characterized by a defective phenylalanine hydroxylase enzyme, which is normally responsible for the metabolism of phenylalanine to tyrosine. This results in the accumulation of phenylalanine and its breakdown products in the blood and the decrease in tyrosine, which increases the risk of neurological damage and mental retardation. Phenylalanine-restricted tyrosine-supplemented diets are a means to nutritionally treat this monogenic disease.

In contrast, many common diseases, such as obesity, cancer, diabetes, and cardiovascular diseases, are polygenic diseases, i.e. they arise from the dysfunction in a cascade of genes, and not from a single mutated gene. Dietary intervention to prevent the onset of such diseases is a complex and ambitious goal.

Recently, it was discovered that the health effects of food compounds are related mostly to specific interactions on molecular level, i.e. dietary constituents participate in the regulation of gene expression by modulating the activity of transcription factors, or through the secretion of hormones that in turn interfere with a transcription factor.

Nutrigenomics refers to the prospective analysis of differences among nutrients in the regulation of gene expression i.e., it studies the effect of nutrients on the genome, proteome, and metabolome. It involves the application of high-throughput genomic tools such as DNA microarray technology in nutrition research. Nutrigenomics is a discovery science which aims at understanding how nutrition influences metabolic pathways and homeostatic control and how this regulation is disturbed in the early phase of a diet-related disease.



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