Calories from carbohydrates come from the sugars and starches found in various foods. When you consume carbohydrates, your body breaks them down into glucose, which is used for energy. Each gram of carbohydrates provides about 4 calories, making them a significant source of energy in your diet. Carbohydrates are found in foods like fruits, vegetables, grains, and legumes. They are essential for fueling physical activity and supporting brain function. However, not all carbohydrates are created equal; simple carbohydrates like candy and soda can lead to quick energy spikes, while complex carbohydrates from whole grains provide more sustained energy.