Cellular metabolism refers to the series of chemical reactions that occur within cells to convert food into energy. This process is essential for maintaining life, as it provides the energy needed for various cellular functions. The two main types of metabolism are catabolism, which breaks down molecules to release energy, and anabolism, which uses that energy to build new molecules. During cellular metabolism, cells utilize nutrients like carbohydrates, fats, and proteins. These nutrients undergo processes such as glycolysis and the Krebs cycle to produce ATP (adenosine triphosphate), the energy currency of the cell. Efficient metabolism is crucial for growth, repair, and overall health.