Which macronutrient is classified as sugar?

The classification of sugar falls under carbohydrates. Carbohydrates, which can be divided into simple sugars and complex carbohydrates, are a primary source of energy for the body. Simple sugars, which are often referred to as "sugars," include molecules like glucose and fructose. These sugars are easily digestible and quickly provide energy.

In the context of nutrition, it's important to understand how carbohydrates function in the body. They are not only essential for energy but also play a role in various metabolic processes. In contrast, proteins are primarily involved in building and repairing tissues, fats serve as a source of energy and help in the absorption of fat-soluble vitamins, and vitamins are essential micronutrients that support various physiological functions but do not serve as a direct source of calories or energy.