All groups gained weight. The normal- and high-protein groups gained the most weight (13-14 lbs vs 7 lbs for the low-protein group), and all groups gained roughly the same amount of body fat.
In other words, overeating caused weight gain regardless of weather they were overeating a high-protein diet or a low-protein diet.
Even though the low-protein group gained weight, they lost a small amount of lean body mass (muscle).
Dr. Bray notes that this shows that not eating enough protein -- a diet containing only 5% protein -- will not prevent loss of lean body mass. He notes that this finding was unexpected.
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