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RE: Turning White Fat to Beige Fat - New Disconfirming Evidence on IL-4 Contribution [Research]
They say that Michael Phelps the swimmer ate 12,000 calories a day while training -- that's 4 times the normal calorie intake.
Now -- certainly he was burning a lot of energy to swim. But -- he was also spending hours each day in pool water of around 80 degrees (olympic racing mandates pool temps of 77 - 82 degrees.)
I bet his brown fat was healthy and functional!