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Same problem here. I'm also confused because some sources say coffee (black) is OK during fasting, but I've also heard that even black coffee "wakes up" the metabolism enough to lose the benefits.

Could someone who knows about this comment or post links to info: is black coffee during fasting periods OK?

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There needs to be something with calories to metabolize to end a fasting period, coffee has low/no calories, you can have up to a fifty calories before the fasting is broken. Caffeine is metabolized, but has no caloric value so I don't think it would count.

https://jamesclear.com/reader-mailbag-intermittent-fasting

Good discussion here. It sounds like some IF studies have had positive effects even if the participants are taking black coffee, however, the caveat is that they don't know whether not having black coffee would be more beneficial.

https://www.foundmyfitness.com/episodes/coffee-and-amino-aci...

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