Which of the following is an example of non-fuel nutrients?

Vitamins are classified as non-fuel nutrients because they do not provide energy (calories) to the body like the other nutrients do. Instead, they serve various critical roles in maintaining health, supporting metabolism, and facilitating numerous biochemical processes. While proteins, fats, and carbohydrates are macronutrients that contribute energy, vitamins are micronutrients that assist the body in utilizing those macronutrients effectively and support overall bodily functions.

In essence, non-fuel nutrients like vitamins help with preparing the body to use the energy provided by fuel nutrients, but they do not directly serve as energy sources themselves. This distinction is fundamental in nutritional science, as it highlights the diverse roles that different types of nutrients play in maintaining physical health.