What is an example of a nutrient classified as a carbohydrate?

Glucose is classified as a carbohydrate because it is a simple sugar, or monosaccharide, that serves as a primary energy source for the body. Carbohydrates are one of the three main macronutrients, alongside proteins and fats. They are essential for energy production, particularly for the brain and during physical activity. Glucose is involved in various metabolic processes and is readily available in the body as a key fuel.

In contrast, the other options represent different categories of nutrients. Proteins are made up of amino acids and are essential for tissue repair and growth. Fatty acids, which classify under fats, provide a concentrated source of energy and support cellular function. Vitamins are organic compounds necessary for various metabolic processes, but they do not provide energy themselves like carbohydrates do. This distinction highlights the unique role of glucose as a carbohydrate.