Foods that are digested quickly include carbohydrate foods, especially those with a high glycemic index (a measure of how a food raises blood sugar). Foods such as white bread, white rice, crackers, pastries, candy, cereals, fruit and vegetable juice, and fruit are digested quickly. Other foods that digest relatively quickly include raw or cooked vegetables, oats, and legumes (beans, lentils, and peas). However, keep in mind that these foods are digested quickly when eaten alone. Any foods containing fat, protein, or extra fiber eaten in combination with them will increase digestion time.