When you eat, your food must be digested, which is the breakdown of food into smaller molecules. what are those molecules used to make?

the molecules are broken down in order to release energy,water and carbon dioxide

Digestion breaks down food into nutrients. Those smaller molecules are used for energy, growth, and cell repair. The body breaks down nutrients from foods ( and drinks ) into proteins, fats, carbohydrates and vitamins.

geologic time scale (for gradpoint) =)