Raisins. Raisins contain tartaric acid and are high in fiber, making them a natural remedy for constipation. One study showed that consuming just four-and-a-half ounces of raisins a day caused food to be pushed through the digestive tract twice as fast. Apricots and cherries are two foods that are also helpful for those dealing with constipation as they are very rich in fiber. Combine these fruits with a serving of yogurt to add the benefit of probiotics to your diet.