Evan argued with his parents that he should be allowed to eat whatever he wanted, because of the "wisdom" of his body. However, his body’s "wisdom" evolved when .

Calories were hard to find and high-fat foods were the best sources of  available energy

Explanation:

Nowadays, modern society has the advantage to obtain foods with higher nutritional value compared than high-fat foods. The consumption of these healthy foods may improve the quality of life, and therefore they are the best options to include in the diet

the most common energy conversion is from kinetic energy to potential energy, and then from potential energy to kinetic energy.

later on comes the heat energy, mechanical energy, and other energy conversions.

this energy conversion is so common that we can find it in our day to day lives as well.

- one of the most common energy conversions involves the changing of potential energy to kinetic energy or kinetic energy to potential energy