Constipation can happen because the colon absorbs too much water or is sluggish. Insufficient fiber intake is the likely cause in most cases. Soluble fiber from oats, rice bran, and fruit will help to 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 the intestines. To meet your daily fiber needs, aim for at least 2 servings of fruit and 3 cups of vegetables/ legumes. Also, drink at least 8 glasses of water to aid regular bowel movement.