I find the easiest fasting mimicking diet to do is heavy cream in coffee. None of that 50 calories a day stuff, that just covers one coffee. Like Ken, small amounts of food can be harder for me than outright fasting, cream in coffee doesn't seem to be a problem that way for me. From the purity standpoint--if you find a modified fast easier, I say go for it. Is a pure water fast better? I've never seen Longo's modified fast put up against a pure fast directly, so I don't know. I know there's evidence for benefits from either one. Water fasting is certainly liable to be a stronger dose. Is the strongest dose possible always ideal? If we had no data on a fasting mimicking diet, as a caution we could tell people to only do pure water fasts, we wouldn't know how much food it would take to ruin the therapeutic benefits of fasting. We have a growing body on the benefits of the fmd, I think it makes sense to admit that it exists.