Common sources of dietary carbohydrates include grains, fruits, dairy, and vegetables. Whole grains, such as brown rice and whole wheat bread, provide complex carbohydrates and essential nutrients. Fruits are rich in natural sugars and dietary fiber, which aids digestion. Dairy products like milk contain lactose, a form of sugar. Vegetables also deliver carbohydrates, particularly in the form of fibers and starches. Incorporating a variety of these sources can ensure a well-rounded intake of carbohydrates, essential for energy and overall health.