How are macronutrients defined?

Macronutrients are defined as nutrients that are required by the body in large amounts to support growth, metabolism, and overall health. This category includes carbohydrates, proteins, and fats, which are all vital for supplying energy and supporting bodily functions.

Carbohydrates are the primary energy source for the body, while proteins are crucial for tissue repair and building, and fats are important for energy storage as well as the absorption of certain vitamins. Each of these macronutrients plays distinctive roles in nutrition and contributes to a balanced diet.

The other options do not accurately describe macronutrients. Nutrients required in small amounts refer typically to micronutrients like vitamins and minerals. Nutrients found only in animal products would not encompass all macronutrients because, for example, carbohydrates are primarily found in plant-based foods. Lastly, nutrients with no caloric value typically refer to substances like water or certain minerals that, while essential for health, do not provide energy in the form of calories. Thus, the correct identification of macronutrients clearly aligns with the definition provided in the correct choice.