The problem with fasting is that some diabetics have hypoglycemia. I'm not hypoglycemic myself but I struggle to fast more than a single meal in a day, and even that is stretching it on some days. It's weird, some days I can go a long time without eating but then other days, I struggle even if my meals are delayed.

That's my issue with a lot of diets, I've tried a few but can't seem to stick with them (and not just because I disliked it).