Nutritional substances are necessary for the body to function properly. As well as providing energy and supporting growth and development, they contribute to overall health and wellness. The chemical composition and biological functions of nutrients define the different types of nutrients we can obtain through food, supplements, and medications. There are various types of carbohydrates, proteins, fats, vitamins, minerals, and water. In the body, each nutrient plays a unique role and is needed in different amounts depending on age, gender, health status, and other factors. Nutrient types and their functions are essential for maintaining optimal health and preventing nutrient deficiencies.