He recently wrote a six-part series on "Ancestral Health." It's his response to arguments presented at the Paleo conference in Los Angeles last month. (The Paleolithic Diet is based on the presumed diets of hunter/gatherer humans that lived about 100,000 years ago.)
This is an excerpt from his Part 2:
"Our total need for protein isn’t that great. The US government, which is no enemy of the beef and dairy trusts, says that adults need about 60 grams of protein a day, which is about 2 ounces- a little more for men and a little less for women. 60 grams of protein comes to 240 calories, and if a man gets 2400 calories total, that comes to 10% of calories. The government admits that there is a significant “safety factor” (excess) built in to that figure, and other organizations, such as the World Health Organization, cite a much lower requirement."Protein eaten above our needs gets broken down and some of it can be used as fuel. This is what he says about consuming protein above our needs:
"One researcher who has studied it a lot is Dr. Mark Hegsted of Harvard University, and he concluded from his vast work that, based on all the considerations for protein utilization in the body, that humans need .8 grams of protein per kilogram of body weight.",
"So, we can use protein as a fuel. So, what’s the big deal? The big deal is that 15% of the amino acid is nitrogenous, and nitrogen doesn’t burn. When that amino group (NH2) gets split off, it immediately tends to pick up another hydrogen (since nitrogen has three hands) forming NH3 which is ammonia. You know how caustic and irritating ammonia is. Burns the nose, right? Well, it burns inside of you as well. The body has to get rid of ammonia pronto, so it combines two amino groups with one molecule of carbon dioxide to form a different substance: urea. Urea is essentially non-irritating. It is a waste product, but it doesn’t burn like ammonia. So, it’s easier to handle. The more protein you eat, the more urea you form. And the more urea you form, the greater the burden on your liver and particularly your kidneys.This is a fair argument. In older people, people with hypertension, diabetes, kidney or liver conditions, excess protein does present a problem. What does a low-protein Paleolithic Diet look like?
"People who eat high-protein diets tend to have higher levels of blood urea nitrogen (BUN). Ideally, BUN should be in the teens. I have even seen it in the single digits in people who scrimp on protein. But people who eat high-protein diets are usually in the 20s, and sometimes in the 30s, and I don’t consider it a good thing or a harmless thing. Why should turning the blood more urinous be considered OK?"