Energy metabolism
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Lactate is a fuel, not the thing that burns
Working muscle ships lactate as a fuel other tissues can oxidize. The burn is not lactate acting as a toxin.
Energy metabolism -
A late meal and the next morning's insulin
Eating late lands the meal when insulin sensitivity is already lower, and the next morning still shows it.
Energy metabolism -
The afternoon dip is a pacing problem, not a moral one
The mid-afternoon slump is circadian and post-meal, with mitochondria supplying ATP at the pace the cell allows.
Energy metabolism