Again, diet plays a more important role in anal fist fucking than it does in vaginal fisting. With a proper diet, you can clear out the anal canal prior to fisting. Starting 2 or 3 days prior to your fist fucking session, begin eating more high fiber foods than normal. Stay away from dairy products and fatty meats. Also avoid foods high in simple carbohydrates (sugars, potatoes, french fries, chocolate). Eat lots of fruits and vegetables and drink lots of water (up to 2 liters/day).