I believe in fasting as a very effective weight maintenance mechanism in the following manner. Weigh yourself in the morning every day or every few days. At some point the scale will suprise you with a value that is higher than expected. That is the signal. Do not eat on that day (until breakfast the next day).

Some things of note:

* You will be overfed when you start your fast. Malnutrition is not a concern since that is a matter of degree. One day of fasting won't take you from overfed to malnourished.

* Your fast may drain more than just your glycogen and your digestive system contents. To ensure it is draining body fat and not muscle, make sure you are doing resistance exercise (gliding - see my previous post). Don't worry about not having enough protein - if you are overfed from the day before (and weren't on some weird low-protein diet), you have plenty of free protein floating around, and your body can scavange it.