What is a calorie?

What is a calorie?

A calorie is a unit of energy in food.

Your body uses energy for everything from breathing to talking to exercising.

1 calorie of food supplies your body with 1 unit of energy
150 calories of food supply your body with 150 calories of energy.

Calories in food come from 4 sources:
  • Carbohydrates
  • Protein
  • Fat
  • Alcohol

1 gram of carbohydrate = 4 calories
1 gram of protein = 4 calories
1 gram of fat = 9 calories
1 gram of alcohol = 7 calories

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Stephanie Averkamp

About the Author was created by Stephanie Averkamp, a recognized health and fitness professional and sole-author of the content on this website. Stephanie's approach to weight loss emphasizes making small, realistic, and permanent lifestyle changes. Read more...

Stephanie Averkamp

Our Approach: Short-term solutions (like dieting) are unrealistic and ineffective because at some point they end. As soon as a diet or program ends, so do the results. Permanent weight loss is a journey; it's not a race or competition and there is no finish line. Read more...