Staying a healthy weight is about making sure that you and your family keep an energy balance. Energy is another word for "calories." What you eat and drink is ENERGY IN. What you burn through physical activity is ENERGY OUT.
The same amount of ENERGY IN (calories consumed) and ENERGY OUT (calories burned) over time = weight stays the same
- More IN than OUT over time = weight gain
- More OUT than IN over time = weight loss
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Source: National Heart, Lung, and Blood Institute