Oh I see. In that case, I'm getting two completely different things mixed up.
Yea, if you eat nothing but protein, that isn't going to cut it. You can't really get much energy from that. You need fat to go with it. Well if that is what he was talking about that supports what I was saying more than it supports him.
I thought he meant that oddball study where meat damaged the kidneys of rabbits. I was wondering why anyone would bring some quackery like that.
Good that it got cleared up while I was sleeping ;-). I think most of the studies are designed with the outcome in mind. Then the researchers, do everything possible to get the expected results, even fudging results. The bright ones will design it so that they don't have to fudge any results. That is a very big problem in science. But that is what the project grant system expects. You need to work on a theory that is already well accepted and add something to it. Going against the stream only makes your hard work get ignored.
The real problem with high protein is that say you eat 300gms of lean protein. Lets say that 100gms are required for body building. The remaining 200gms is going to be converted to glucose. To get 200gms glucose you need to burn 30% of the energy (I am not sure but it seems to me that this energy must come from fat). So you need about 200*4*3/(10*9) = 27gms of fat to go with it, just to be able to use the remaining 200gms of protein. In addition our body requires a lot of fat as a building material. Without this fat you will burn your own fat, and if you don't have enough body fat, you will be in trouble. This kind of leaning out is called Rabbit Starvation.
The other problem is Kleiber's law. Our body has a surface area, with which we discard heat. The metabolic system in our body is very old. It developed even before mammals developed. So all mammals generate heat only proportional to their surface area or approximately relative to their mass. It is a fact that all mammals have an average metabolic rate proportional to their mass to the power of 3/4.
Now for humans our brains are enormous, and they use a whole lot of energy as much as 600calories which would be about 25% of total energy usage of a normal person. That 3 pound organ (<2% of human body) uses up more than 20% of the energy. If you convert 200gms of proteins to glucose you are producing 250kcal of heat during the conversion. This is also part of your metabolic rate.
The effect of the above is that we have a set ideal metabolic rate. There will be a range that is good for us, but the range is not infinitely stretchable. Moderation seems to be an important key.