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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-...