What is the main reason that humans need to include carbohydrates in their diets?

Carbohydrates are essential in the human diet as they serve as the primary source of energy for the body. They are broken down into glucose, which fuels vital functions, including brain activity and physical exertion. Additionally, carbohydrates play a role in digestive health by providing dietary fiber, which aids in digestion and helps maintain a healthy gut. Including carbohydrates in the diet ensures balanced nutrition and optimal functioning of various bodily systems.