That dual role is part of why the research base touches so many systems: skin, hair follicles, wound beds, lung, gut, and bone in animal and cell models
However, for most people we recommend the stomach area around the belly button, because it tends to have the most fat
That is the honest answer to the argument you will find in forum threads: the rule is conservative and administrative rather than empirical, and it is still the number to use, because the alternative is having no number at all
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