You need fibre: Bananas, berries (Blackberries and raspberries), Beans(green beans, lima beans, broad beans, pole beans and snap beans), Bran Cereals, breads (wheat, pumpernickel and seven grain), broccoli, Brussels sprouts, dried figs, liver, fish liver oils, kidneys, butter, some margarines and spreads, full cream dairy products, Carrots and sweet potatoes, broccoli, yellow and orange vegetables, chocolate , apple, pear, dried figs, greens (beet greens, collards, kale, spinach and turnip greens), lentils, peas, sweet corns, rice, bran flakes, prunes, weetbix, oats, whole meal breads, nuts and brown rice.
If none of that works you could try sticking a vaccum clearer up your ass!