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What is a calorie?

the energy it takes to raise the temperature of 1 gram of water 1 degree Celsius

The first law of thermodynamics (the conservation of energy

matter can neither be created nor destroyed, so energy must be transferred from one system to another (in various forms)

Calories In/Out

If you have too much energy in your body, you will grow larger. If you have too little energy in your body, you will get smaller.

Fat

9 calories/gram

Protein

4 calories/gram

Carb

4 calories/gram

USDA Dietary Guidelines

say to balance calories

Obesity

often blamed on a "toxic environment" in the U.S.

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