There is a yahoo group with people on a variety of diets who share experiences and scientific information. This is what they say about themselves: This group is devoted to intermittent fasting and its effects on
physiology and health. We expect that both practitioners of intermittent
fasting and scientists with an interest in the physiological effects of
intermittent fasting will want to join. The founding members are both
practitioners and scientists. We are interested in the idea that
intermittent fasting may be a preferable way of obtaining the health
benefits associated with caloric restriction (including, but not limited
to, weight loss). Although we are interested in many aspects of
fasting, including styles, effects and reasons to fast, this group is
not about multi-day fasts, colonics, the purging of toxins or the
attainment of spiritual goals. This is not the place for those who are
interested in longer fasts.
There's a facebook support group for people on either alternate day fasting or 5/2 fasting here. There is a resources section on the group where people share recipes and information. It's a very busy group, but there are a lot of people with experience of all the different ways of fasting/eating, so it is a good place to get answers to questions.