On: Intermittent fasting more effective than calorie r...

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An old fashioned way of fasting preserves muscle mass way better due to hormonal response. It only kicks in after 30-40 hours of fasting. I don’t think that a lot if people practice 3-4 of fasting when doing IF.

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Longer periods of fasting reduce testosterone, which probably negates whatever GH benefit it provides: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9182756/

And why would your body go out of its way to preserve metabolically more expensive tissue during longer periods of deprivation?

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Any kind of caloric restriction lowers it temporarily. There is some evidence that testosterone levels can be even higher after the fasting https://josepheverettwil.substack.com/p/how-fasting-changes-...