Final answer:
Chemical energy from food that is not converted into ATP is primarily stored in the body's fat cells as triglycerides. Excess energy can also be converted to thermal energy or used for bodily functions that require energy.
Step-by-step explanation:
The body uses the chemical energy of food in several ways. When food is not converted to the chemical energy of ATP, the body either:
- Stores it in the body’s fat cells,
- Converts it to thermal energy, or
- Uses it for work such as muscle contraction and other metabolic processes.
Specifically, excess energy is stored as triglycerides in the body's fat cells for later use. This is a biological strategy for energy conservation, allowing the body to tap into stored energy reserves during periods when food intake is not sufficient to meet the body's energy demands.