> I climb often (vigorously, 4 times a week if not more) You're very active! Even so, I wouldn't think the IF itself was the problem, probably you were having

> I climb often (vigorously, 4 times a week if not more) You're very active! Even so, I wouldn't think the IF itself was the problem, probably you were having trouble eating enough for your level of activity with such a regimen. About bloodwork, I believe you're mistakingly conflating insulin and blood sugar. Blood sugar may vary in such a way, but it's just a proxy because insulin is so hard to measure. But more to the point, I wasn't referring to intermittent fasting solely, I believe even longer fasting periods are required. Regardless, even IF is a far cry from what the average person does. I also disagree that fasting is not a panacea. It's a close to one as we have. I don't think this is a subject I'm likely to convince skeptics in a comment, so I will simply say interested people will find reputable resources on the subject, including striking anecdotes published by fasting clinics (of which, for some reason, Germany has a few that publish material on YouTube).