There are a few things necessary in your diet to produce a frequent and healthy stool. WATER. You need to be drinking loads of the stuff to hydrate your bowel or it gets stuck, and especially with back/kidney pain. Drink at least half your body weight in ounzes. A simple kidney cleanse is Parsley/cornsilk/nettle herbal teas, drink, drink, drink to flush those kidneys out. FIBRE. Are you eating enough fruit and veg? Have some oatbran porridge every morning. Add a tablespoon of flax seeds (drink more water for this one). OIL. You need good quality oil (not cooking oils or animal fats) to lubricate. A tablespoon of olive oil once a day (good for candida) or walnut, and the Omega oils from fish or flaxseed.