what they don't mention (or what they didn't looking into in this study) is the potential side effects this diet could bring along: digestive? over acidic body enviroment? would be interesting to have 360-degree research done on these diets, including investigating potential side effects.
surely over 300g of protein daily cannot be healthy long term.
what i think is that apart from the protein's thermic effect, the fact the high protein group didn't gain weight or put on extra lean mass could be down to the fact that their bodies simply couldn't handle digesting all that protein and this is what I believe could lead to side effects. they probably just eliminated what the body couldn't process...