Here's Peter Attia talking about some of the potential problems - https://www.youtube.com/watch?v=x6wczdlcBtI - his perspective is particularly refreshing because he was a big proponent of intermittent fasting / time-restricted feeding for a long time.
I've actually been kinda confused about my diet for a year or so. I gained a bunch of weight and thought it was because of meds, but a couple of years ago on a similar diet I lost a bunch of weight. I guess I'm just following procedures instead of counting calories these day.
Just eat the whole fruit. It still has sugar but the time it takes for your body to slowly digest it means the sugar is released slowly and you get a steady flow of energy.
https://www.youtube.com/watch?v=zFxAHRo4NqM
He used to do four 7-day fasts per year (one per quarter). He's chilled on that though after doing a dexa scan and seeing how much muscle mass he's lost. Exercise seems to be what he's focusing on now. He tweeted this, which I found remarkable: https://twitter.com/PeterAttiaMD/status/1499407558468980736/...
Basically, the hazard ratio of being a smoker is _better_ than that of someone who doesn't exercise. Louder, for those in the back:
No exercise is worse than smoking
HN fasting, low-carb, and keto zealots (there's massive overlap) really hate being told that their fad diet(s) don't work or are outright dangerous. In fairness, it does look like if you're extremely diligent in terms of meeting your protein requirements, even OMAD might not cause muscle loss, but in general, it seems like a bad idea.