The Overfeeding Studies
In one study published in JAMA, scientists asked people to eat about 1,000 extra calories every day for eight weeks.
Some people ate low protein, some ate medium, and some ate a lot of protein, about 230 grams each day.
Even though everyone ate more food, the high-protein group gained muscle instead of fat.
The low-protein group mostly gained fat and even lost some muscle. (Bray et al., JAMA, 2012)
In another study at Nova Southeastern University, trained lifters ate over 4 grams of protein for every kilogram of body weight.
This is about five times the normal amount.
They did this for two months.
This gave them around 800 extra calories every day, all from protein.
Still, they did not gain any extra fat at all.
Their bodies just used the protein for energy and muscle repair instead of storing it as fat. (Antonio et al., JISSN, 2014)
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