The best rebuttal I have heard is by Matt Lalonde PhD, a Harvard biochemist, from here OPT: The Science of Nutrition Login. It in the first part of this seminar. Problem, it ain't free and will cost you $99. That said, you can watch it as often as you want and it is 6 hours of nutritional info.
What Matt does is show the logical flaws in the China Study where Campbell throws in confounding variables to make his argument. For example (and I'm attempting to pull this from the seminar), Campbell attempts to show a link between animal and plant protein to colorectal cancer. The association Campbell attempts to make is A animal protein (hence saturated fat) => cholesterol => colorectal cancer. Matt says the association Campbell is make is akin to "as ice cream sales increase, outdoor temperatures increase, and so do deaths by drowning. (B for beta) Ice Cream B= large positive # => Outdoor Temerature B = large positive # => Deaths by Drowning. So the analogy to Campbell is people are eating more ice cream getting in the water, getting cramps, and drowning.
However, if you just pull the direct correlation for animal and plant proteins to colorectal cancer animal protein is negative, but statically insignificant. Plant protein is positive, but statistically insignificant. "There is no association" - Lalonde. The strongest association between colorectal cancer is with the virus Schistosomiasis Schistosomiasis - PubMed Health. Cholesterol is used to "shuttle indotoxins out of the body so they are going to increase in numbers." "The people who had the higher cholesterol levels also had more schistosomiasis." "If we look at the correlation between total cholesterol and colorectal cancer in regions with zero schistosomiasis infections, we obtain B = +0.13, P>0.5"
Hope that gives you something to focus on. Matt used this one example from The China Study but says Campbell pulls the same strategy throughout the book. Mat does, however, agree with Campbell that protein "promotes" cancer growth. It doesn't cause cancer, however. Cancer cells use seven times as much glucose as regular cells so they will rely upon protein gluconeogenesis. So if it's glucose that's feeding the cancer a vegetarian diet high in carbs (the don't have to be) is also fueling the cancer.
Last edited by Scott F; 10-18-2012 at 12:18 PM.
Would I be putting a grain-feed cow on a fad diet if I took it out of the feedlot and put it on pasture eating the grass nature intended?