Highly processed foods, and foods high in sugar, should be avoided as much as possible. Opt instead for a diet rich in fiber, antioxidants, and bioflavonoids. The ideal diet would consist of plenty of fresh fruits, vegetables, and whole grains. You should also strive to drink plenty of liquids, and especially water. Think of your body as a vessel: the cleaner you can keep it, the less likely that it will develop hemorrhoids.