When you eat a hamburger, some of the energy in the food is converted to ATP that your cells can use to do all kinds of work, some of the energy is stored for later use, and some of the energy is dissipated as heat. The amount of energy before and after eating the hamburger is the same. This illustrates the:

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The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, only converted from one form to another. In the case of eating a hamburger, the energy in the food is converted to ATP for use by cells, stored for later use, or dissipated as heat, but the total amount of energy before and after eating remains the same.

When You Eat a Hamburger, Some of the Energy in the Food