According to one reader, this condition may arise from a lack of sodium or potassium in the body, resulting in adequate absorption of water. This is a common problem what with people attempting to eliminate salt from their diets. To top up sodium levels this summer, try melons, green vegetables, and a little sea salt. Another reason for chronic constipation is a lazy colon. To kick your colonic muscles into shape, try a brief (5 minute) iced-water enema each morning for three months. Use filtered or bottled water with a few ice cubes added. Or go with the advice of one woman's chiropractor and try the food combination diet (which advocates the separation of starches and proteins for more efficient digestion). Her chiropractor also relieved the pressure in her lower back, explaining that the nerves in this area affect the small and large intestines.