Does anyone know if drinking coffee black stops autophagy and "technically" breaks a fast? I seem to recall reading that a while ago, but can't find the source.
As for autophagy, as far as I know there are no good biomarkers to determine autophagy levels, so it's hard to say whether black coffee stops autophagy, or even whether you've entered a state of increased autophagy as a result of the fast, regardless of length or methodology. It'd be great to have some, though.