What is one of the primary roles of nutrients in the body?

Nutrients play a crucial role in the body by supporting growth, repair, and energy production. This encompasses a wide variety of functions essential to human health. Macronutrients such as carbohydrates, proteins, and fats provide the energy required for daily activities and physiological processes, while micronutrients, including vitamins and minerals, are vital for regulating bodily functions and facilitating various metabolic pathways. For example, proteins are necessary for building and repairing tissues, carbohydrates are the body's primary energy source, and fats are important for cell structure and hormone production. This broad and integrated functionality highlights the importance of a balanced diet rich in diverse nutrients to maintain overall health and well-being.

In contrast, the other options do not accurately reflect the primary roles of nutrients. Promoting unhealthy weight gain does not align with the intended purpose of nutrients, and while aiding in digestion is a part of some nutrients' roles, it does not encompass all of their functions. Detoxification of substances can occur in the body, but nutrients primarily focus on supporting the body's growth, maintenance, and energy requirements.