The major nutrients—protein, carbohydrate, and fat—provide the body
with energy. This energy keeps your heart beating, your brain active, and your
muscles working. The energy is measured in calories.
Nutrients in foods
| Nutrient|| Function|| Some sources|
|Protein has 4 calories per gram|| Provides energy; builds and repairs
body cells; part of various enzymes, hormones, and antibodies||Meat, poultry, fish, eggs, beans, milk
and milk products, grains, seeds and nuts|
|Carbohydrate has 4 calories per gram|| Provides energy needed by the brain,
nervous system, and red blood cells||Breads, cereal grains, pasta, rice,
fruit, starchy vegetables, milk, sugar|
|Fat has 9 calories per gram|| Provides energy; carries fat-soluble nutrients (vitamins); part of cell membranes, membranes around
nerves, hormones, bile (for fat digestion)|
Meat and poultry, some fish, milk and
milk products that are not fat-free, nuts and seeds, oils, butter, margarine, salad dressing, some
candy, some desserts
WebMD Medical Reference from Healthwise
November 14, 2014
This information is not intended to replace the advice of a doctor.
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Major Nutrients in Food Topics