Constipation can happen because the colon absorbs too much water or due to sluggish colon muscle contractions. Insufficient fiber intake is the likely cause in most cases. Soluble fiber from oats, rice bran, and fruit help soften stools for easy elimination. Whole grains, cereals, seeds, and the skin of most fruits and vegetables provide insoluble fibers that help the stool pass quickly through intestines. To meet your daily fiber needs, aim for at least 2 servings of fruit and 3 cups of vegetables/ legumes. Drink at least 8 glasses of water to aid regular bowel movement.