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Fats and carbohydrates
share the primary function of being energy sources for the body,
but they also perform various other functions. (Fats, for
example, are needed for the absorption of fat-soluble vitamins.)
Fats consist of fatty acids and glycerol, the fatty acids being
either "saturated" or "unsaturated."
Unsaturated fatty acids are more readily "burned" for
energy than saturated ones, and they appear to be connected with
lower blood cholesterol levels. Animal fats are generally high in
saturated fatty acids, and vegetable fats in unsaturated fatty
acids.
Carbohydrates -- which comprise the bulk of
most of the world's diet -- are sugars or compounds that break
down into sugars in the digestive process. Starch is a common
form of carbohydrate found in grains, bulbs, roots, and tubers;
the various sugars are common especially in fruits, sugar cane,
sugar beets, and milk. (The structural plant material
cellulose is also a carbohydrate, but we can't eat trees because
our bodies have no digestive enzymes to break cellulose down into
usable sugars.) Meats may provide small amounts of stored
carbohydrates in a form call glycogen.
Sources of Vegetable Fats: avocados,
nuts, olives, seeds, soybeans, vegetable oils (e.g., corn,
cottonseed, peanut, soybean, safflower seed, sunflower seed,
walnut), wheat germ.
Sources of Carbohydrates: apples,
apricots, bananas, beets, blackberries, blackstrap molasses,
blueberries, brussels sprouts, carrots, cherries, dates, figs,
grapes, Indian corn, kidney beans (dried, all kinds),
lentils, lima beans, nuts, oats, parsnips, peas, potatoes,
prunes, raisins, raspberries, rice, sesame seeds, soybeans,
sunflower seeds, sweet potatoes, wheat, yams, yeasts (edible).
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