Fats
Fats are glyceryl esters of fatty acids. Fats, as do carbohydrates, contain the elements carbon, oxygen, and hydrogen, but the proportion of oxygen in fats is less, and it can be can said that fats are fuel foods of a more concentrated type than are the carbohydrates.
Carbohydrates and fats are interchangeable as fuel foods, but it can be shown, by calorimeter, that fats produce more than twice the heat energy produced by carbohydrates.
One gram of fats yields 9 cal, while 1 gram of carbohydrate yields 4 cal. An additional advantage of fat form viewpoint of energy availability is that it stores well in large amounts in adipose tissues.
Thus fat, considered to be a reserve form of fuel for the body, is an important source of calories.
Paradoxically, this is not advantageous in affluent societies where the problem is not the availability of food for energy, but rather the health hazard of obesity.
Fats may occur in foods as materials that are solid at room temperatures or as oils that are liquid at room temperatures. Solid fats contain comparatively small amounts of fatty acids with two or more groups of adjacent carbons that are not fully saturated with hydrogen.
Fats
Nutrition is a science, a field of knowledge composed of organized facts. The study includes in areas, such as clinical nutrition, community nutrition, public health and food policy and food science. Nutrition too is a science of how the body use food. Nutrition is life. The science of nutrition helps us improve our food choices by identifying the amounts of nutrients we need, the best food sources of those nutrients, and the other components in foods that may be helpful or harmful.
Monday, June 08, 2009
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