Well, first, thank you for calling me on that, Grady. Made me check my reference, which I'll list at the end of this post, and correct the "fact" floating in my head.
According to the American Council on Exercise (ACE), "non-athletes require only 12 to 15%" of their caloric intake as protein (141). Still, 0.5 to 1.5g/lb is excessive; athletes require 1.2 to 1.8g/
Kg of body weight, which equates to 0.5 to 0.8g/
lb of body weight (129).
ACE continues to explain that the amino acids (proteins) in supplements can throw off the body's natural amino acid balance and even prevent the absorption of essential amino acids, throwing off the body's chemistry in a very unhealthy fashion. There are other issues as well, including "dehydration, loss of unirary calcium, weight gain, and kidney and liver stress." (141)
Work Cited:
Bryant, Cedric X. and Daniel J. Green, eds.
ACE Personal Trainer Manual. San Diego: American Council on Exercise, 2003.