That must be why nearly 50%+ of the US and 40%+ of the world is overweight. Got it.
I have read in the past that brown fat is formed during childhood. Children who are active and not overweight will develop brown fat which lasts into one’s older years even if one becomes obese later.
There is likely a correlation to overfed, underactive children not developing brown fat which causes all the fat cells to be white, useless, disease-causing fat.