Summary: To properly break a fast, gently coax the body back into eating solid foods by beginning with clear soups, broths and fruit juices. Break a fast slowly, avoiding foods that are hard to digest, with health information from a chiropractor and addictionologist in this free video on fasting.
"Hi, my name is Doctor Kim Makoi, I'm a holistic chiropractor from San Francisco, California and this is how to break a fast. After a fast you may be feeling pretty good, much higher energy, clearer thinking. And you may feel like your body is ready to jump right back into its normal eating patterns, but it's definitely not. Your digestive system has been taking a bit of a rest and it needs to be very gently reintroduced to solid food. So after a fast start out with clear soups, vegetable broths and maybe some simple fruit juices, preferably freshly squeezed. A lot of people like to use orange juice as they're coming off of a fast. Make sure to keep your water intake still pretty high, and avoid foods that are harder to digest. So you definitely wouldn't want to start - break a fast with meats or pizza or anything like that. And that is how you break a fast."
eHow Article: How to Properly Break a Fast