Energy can neither be created nor destroyed, but only converted from one form to another = the first law of thermodynamics.
An energy balance means that you consume as many calories as you burn over a 24-hour period or a longer period of time.
We eat 0.5–1 ton of food per year! An extra 50 calories per day (an apple) adds up to a 2-kilogram weight gain in one year. Energy balance is maintained by keeping your weight steady!
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