Don't forget about prunes! Soak 5 sun-dried prunes in water for 48 hours, then eat the prunes in the morning and drink the juice at lunchtime. Another option is to use supplemental magnesium. Start with a calcium-and-magnesium supplement in the ratio of 1:1 (as opposed to the more popular 2:1). If constipation persists, keep adding one tablet containing 250mg of magnesium (as citrate or another easily-digestible form) every three days until it works. Don't increase the amount of magnesium too quickly, because it accumulates, and so does its laxative effect!