I mean, we're quickly getting into "somebody once told me" territory here, but: word on the street is coffee triggers / speeds up autophagy, not slow it down?
Madness, I tell you.
Good luck and have fun with the intermittent fasting :)
Far and wide the best ground advice you can give yourself and others is to work out - that'll do good things to you, even if you can do it a little. Other than that, eat a moderately varied set of foods. Anything further than that is usually just something someone came up with in the shower and that other people thought sounded real good.