I just started intermittent fasting last Saturday with my fiance for our health, given our family histories of heart disease, cancer, etc. I am on day 6 and am blogging the experience here: Lauren Tries Out Alternate Day Fasting
So far I have found headaches on my feast days to be the biggest problem. I have done research on it and have been comparing notes with others, and it sounds like hopefully something that will go away. Ugh. Other than that, I seem to be doing a good job of getting all the nutrients I need on fast days.