Why do organisms consume organic food?

Organisms consume organic food primarily to produce ATP, which is the energy currency of cells. ATP (adenosine triphosphate) is essential for a wide range of cellular processes, including metabolism, biosynthesis, and maintaining homeostasis. When organisms metabolize organic food, they break down the complex molecules within it—such as carbohydrates, fats, and proteins—through processes like cellular respiration. This breakdown releases energy stored in chemical bonds, which is then captured in the form of ATP.

While building cells, absorbing nutrients, and regulating body temperature are important biological functions, they are either secondary or rely on the energy provided by ATP. For instance, the synthesis of new cellular material requires energy, which ATP supplies. Similarly, nutrient absorption itself may require energy, especially in active transport mechanisms. Regulation of body temperature is also a process influenced by energy metabolism. However, the fundamental reason organisms consume organic food is to generate ATP, enabling them to perform all necessary biological functions.