Besides eating prunes, it is recommended that you make certain lifestyle changes. Increase your physical activities. Change your food habits as a proper diet for constipation should include lots of fruits, vegetables, and whole grains. Increase your fluid intake by drinking at least 8 - 10 glasses of water and lots of fruit juices. Prunes, are, no doubt useful. Besides curing constipation, they also provide a number of vitamins to the body and help in lowering cholesterol.