The primary purpose of carbohydrates in the body is to provide energy. When consumed, carbohydrates are broken down into glucose, which serves as the key energy source for cells. This is especially important for brain function, as the brain relies primarily on glucose for fuel. Additionally, carbohydrates play a role in metabolic processes, including the regulation of insulin levels. Incorporating complex carbohydrates, like whole grains and vegetables, ensures a steady release of energy while also providing essential nutrients.