I would have to say a healthy diet with lots of fiber... Get some yogurts or whole grain stuff... Anything that will help you with your digestion. Don't forget to exercise and drink lots of water and vegetables.
What precautions are necessary in the case of hemorrhoids? What kind of diet would help?
Eat a diet high in fiber, do not allow yourself to get constipated, as the straining will make things worse for you. Drink plenty of fluids, maybe a stool softener if you need one.