nutrition
the act or process of nourishing or being nourished; the sum of the processes by which an animal or plant takes in and utilizes food substances
nutrient
any chemical element or compound in the diet that supports normal life processes
6 classes of nutrients
water, carbohydrates, lipids (fats), proteins and amino acids, vitamins, inorganic elements (minerals)
essential nutrients
must be provided in the diet; cannot be synthesized enough or at all
nonessential nutrients
the body can synthesize it on its own; not necessary in the diet
food
edible material that provides nutrients
feed
animal food
food (feed) stuff
any material made into or used as food (feed)
diet
mixture of feedstuffs used to supply nutrients to an animal
ration
daily allotment of food (feed)
60
percent water in an adult mammal
20
percent fat in an adult mammal
16
percent protein in an adult mammal
4
percent mineral in an adult mammal
humans
species varying the most in fat content