
Fasted Exercise and Growth Hormone: Protecting Muscle During Extended Fasting
Timing physical exertion toward the end of an extended fast triggers a growth hormone surge that protects lean muscle tissue from catabolism.
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Timing physical exertion toward the end of an extended fast triggers a growth hormone surge that protects lean muscle tissue from catabolism.

Past two days the metabolic picture changes in kind rather than degree — and so do the risks worth taking seriously.