Here's why:

* Chemical potential energy: This is the energy stored in the bonds of molecules, like those found in the food we eat.

* Thermal energy: This is the energy associated with the random motion of molecules, which we perceive as heat.

When our bodies break down food (through processes like cellular respiration), they release chemical potential energy. Some of this energy is used for bodily functions, and some is converted into thermal energy to maintain our body temperature.