Catabolism, Enzyme, Metabolism, Nutrition, Anabolism, 1. Nutrients1. the proper supply of nutrients essential for growth, reproduction, repair, immunity, and energy 2. the conversion of nutrients into energy 3. cell converts nutrients into energy or materials for growth, repair, reproduction, and maintenance 4. the process by which the cell uses nutrients to repair or build new tissues 5. chemical substances that are absorbed by the body through the process of digestion 6. molecule responsible for facilitating biochemical reactions within the body