Skip to content
My WebMD Sign In, Sign Up

Major Nutrients in Food

Font Size

Topic Overview

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 antibodiesMeat, 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 cellsBreads, cereal grains, pasta, rice, fruit, starchy vegetables, milk, sugar
Fat has 9 calories per gram Provides energy; carries other 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

1

WebMD Medical Reference from Healthwise

Last Updated: October 21, 2011
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
Next Article:

Major Nutrients in Food Topics

Hot Topics

Health Solutions From Our Sponsors

WebMD Video: Now Playing

Click here to wach video: Dirty Truth About Hand Washing

Which sex is the worst about washing up? Why is it so important? We’ve got the dirty truth on how and when to wash your hands.

Click here to watch video: Dirty Truth About Hand Washing

Popular Slideshows & Tools on WebMD

hands on abdomen
Can you catch one?
Woman sitting in front of UV lights
Is yours working?
woman using breath spray
What's causing yours?
womans hand on abdomen
Are you ready for baby?
MS Overview
Recognizing symptoms.
bowl of yogurt with heart shape
Eat for a healthy heart.
woman doing pushups
To help you get fit.
Colored x-ray of tooth decay
Know what to look for.
Woman sitting with child
Do you know the symptoms?
mosquito
Stings, bites, burns, and more.
Allentown, PA
Are you living in one?
Thyroid exam
See how much you know.

Women's Health Newsletter

Find out what women really need.