How do vitamins differ from other organic nutrients?

Vitamins are unique among organic nutrients because they are classified as micronutrients, which means they are required in much smaller amounts compared to macronutrients like carbohydrates, proteins, and fats. While macronutrients provide energy and are needed in larger quantities for growth, metabolism, and overall health, vitamins play critical roles in various biochemical processes but do not supply energy directly. The body requires vitamins in microgram to milligram amounts, making them essential yet needed in relatively tiny quantities for optimal function. This distinction highlights the importance of vitamins in supporting metabolic processes without contributing calories, which is a key aspect of their role in nutrition.