I'm going to make a website soon just so I can host the research studies I have. The reason why I quote the study is because it is quality...if you read it you'll probably agree.

Let me put it up in the next day or two and I'll link you to it.

As for now: here is a little write up from pretty much the most anti-protein exercise physiology book I've ever read: (paraphrased heavily)

"High protein diets"

The normal recommended dietary allowance of .8 g/kg of body weight translates to 60 g of protein for a 170 lb guy. However since exercise increases protein catabolism (destruction) many athletes have turned to high protein diets. The increased protein breakdown during intense exercise is more a reflection of gluconeogenesis for the purpose of maintaining blood sugar levels (aka turning it into sugar for the body) instead of protein catabolism for providing energy to support muscular contraction. Table 12.4 is a suggested protein intake for male athletes:

Sedentary: .8 g /kg
Endurance: 1.4g/kg
Strength: 1.8g/kg

Typically this is a protein intake brought about by the average American diet. However an individual on a calorie reduced eating plan who is active in strength/endurance activities may find it helpful to shift a proportion of their calories to protein to maintain athletic competency.

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The only things I added were in brackets. Eitherway, this would mean 200 g of protein for a 250 lb guy. If you are on a 2200 calorie a day diet, 200 g of protein is 800 calories, or 36% of your total intake. It can approach 40% without worries.

Michael