The China Study
Posted: Sun Oct 17, 2010 9:03 pm
http://www.amazon.com/China-Study-Compr ... 153&sr=8-1
I'm currently reading an interesting book, linked above, which contains as it's main thesis the idea that a mostly vegan diet chock full of veggies and as low as possible in animal fat or especially protein is the healthiest one we can consume.
So far at about 100 pages I've learned about the author's initial feelings that protein is a healthy, animal protein is best, that a traditional US farmer's diet is key, that most nutritional problems are related to animal protein deficits, and explorations in nutrition science that shook his world views.
First, he learned that protein, and in particular protein from animals, is a major cancer promoter in the case of aflatoxin and hepatitis virus. Vegetable protein did not have this effect; the toxin dose could be overcome by reducing animal protein intake. The numbers were pretty impressive but were based on animal research and unusual toxin doses. I am now reading, however, parts of the "meat" of the book which centers on the China Study, which is an enormous epidemiologic study comparing detailed diet data to health outcomes in China, which apparently is by far the best epi study on nutrition ever done. Here we learn that hepatitis B drives a lot of liver cancer but low animal protein intake seriously attenuates any extra risk. I've also read his theories on animal protein and breast cancer, and these pertain largely to the idea that high animal protein diets accelerate menarche and delay menopause, exposing women to higher lifetime estrogens which drive breast cancer. He shows a convincing Western chart showing a clear relationship of fat intake to breast cancer, then turns it on its head by showing NO relation of vegetable fats to breast cancer--it's all animal conveyed risk. I am curious to see if the author has an good explanation coming, because in my mind protein = amino acids which are the same regardless of source once digested. What's the mechanism, if not just lower overall protein intake? Just association with less healthy fats in meat? Or lower effective (complete) protein intake because of insufficiently matched ratios of amino acid intake to amino acid needs?
Some other interesting tidbits include the observation that the Chinese consume a lot more calories than us but don't have issues with calorie retention (obesity) until they adopt our diets. The author promotes the concept of a high carb diet, but the the faddist one from the 70s or 80s with tons of processed carbs--he means mostly veggies. Of import, I had taken it for granted that the American experiment with low fat diets was a failure--we had a low fat craze for decades and we got fat thus carbs = bad. He points out that during that time, we actually increased our fat intake 13 pounds per person per year! We reduced our percent calories from fat but gorged on everything else. Thus, we haven't tried a high carb diet, and certainly not a high carb diet that's that way because of whole grains and vegetables.
He also believes most diet studies are useless because they look at subtle ranges of intakes among Americans or Westerners (it's like asking if smoking 95 cigarettes a day is better than smoking 100) and that single nutrient studies are stupid because things work in concert and you derive benefit from all the other stuff in the veggies from fiber to minerals to other nutrients.
There are also interesting data on lipids in there, such that the low end of the american scale was the high end of the chinese scale--70-170! These are cholesterol values we used to teach were dangerous, but he finds no evidence of the risk for the Chinese, yet those with the lower cholesterol following the vegetable diet have no appreciable heart disease. So far he's described going from a high animal product diet to essentially a vegan one for all these reasons.
I'm sure some readers are wondering if veganism is compatible with competitive athletics and I am curious myself. Certainly I've been convinced we take in far more protein than we need for even vigorous athletics and have decided to dial my intake way down--at least till I finish the book
I figure I can't hurt myself eating plates of veggies, right?
I have always told people that you can't go wrong with veggies and to a lesser extent fruits, and that we should ditch the processed foods completely. I may have to revise my feelings about animal intake and really slash mine. I don't know what I'm going to do without my chicken, fish, and skim milk though :/ I'm curious to see what others would do if convinced animal intake was correlated clearly with poor health outcomes, and to see if anyone else feels like tackling the book, which is an easy read.
Note: there's too much content to list and justify it all, even part way through the book. As it's written for the public, I have some issues with the presentation ("cholesterol"? do you mean HDL or LDL or total or what?? What are the exact p values and stats?). But that makes it accessible and it is extensively referenced, as well as written without an ax to grind. The guy is pro animal research, not a PETA nut, and he used to be a determined carnivore till confronted with his data. I will have to find out more about why there aren't more journal references rather than books generated by the China Study.
I'm currently reading an interesting book, linked above, which contains as it's main thesis the idea that a mostly vegan diet chock full of veggies and as low as possible in animal fat or especially protein is the healthiest one we can consume.
So far at about 100 pages I've learned about the author's initial feelings that protein is a healthy, animal protein is best, that a traditional US farmer's diet is key, that most nutritional problems are related to animal protein deficits, and explorations in nutrition science that shook his world views.
First, he learned that protein, and in particular protein from animals, is a major cancer promoter in the case of aflatoxin and hepatitis virus. Vegetable protein did not have this effect; the toxin dose could be overcome by reducing animal protein intake. The numbers were pretty impressive but were based on animal research and unusual toxin doses. I am now reading, however, parts of the "meat" of the book which centers on the China Study, which is an enormous epidemiologic study comparing detailed diet data to health outcomes in China, which apparently is by far the best epi study on nutrition ever done. Here we learn that hepatitis B drives a lot of liver cancer but low animal protein intake seriously attenuates any extra risk. I've also read his theories on animal protein and breast cancer, and these pertain largely to the idea that high animal protein diets accelerate menarche and delay menopause, exposing women to higher lifetime estrogens which drive breast cancer. He shows a convincing Western chart showing a clear relationship of fat intake to breast cancer, then turns it on its head by showing NO relation of vegetable fats to breast cancer--it's all animal conveyed risk. I am curious to see if the author has an good explanation coming, because in my mind protein = amino acids which are the same regardless of source once digested. What's the mechanism, if not just lower overall protein intake? Just association with less healthy fats in meat? Or lower effective (complete) protein intake because of insufficiently matched ratios of amino acid intake to amino acid needs?
Some other interesting tidbits include the observation that the Chinese consume a lot more calories than us but don't have issues with calorie retention (obesity) until they adopt our diets. The author promotes the concept of a high carb diet, but the the faddist one from the 70s or 80s with tons of processed carbs--he means mostly veggies. Of import, I had taken it for granted that the American experiment with low fat diets was a failure--we had a low fat craze for decades and we got fat thus carbs = bad. He points out that during that time, we actually increased our fat intake 13 pounds per person per year! We reduced our percent calories from fat but gorged on everything else. Thus, we haven't tried a high carb diet, and certainly not a high carb diet that's that way because of whole grains and vegetables.
He also believes most diet studies are useless because they look at subtle ranges of intakes among Americans or Westerners (it's like asking if smoking 95 cigarettes a day is better than smoking 100) and that single nutrient studies are stupid because things work in concert and you derive benefit from all the other stuff in the veggies from fiber to minerals to other nutrients.
There are also interesting data on lipids in there, such that the low end of the american scale was the high end of the chinese scale--70-170! These are cholesterol values we used to teach were dangerous, but he finds no evidence of the risk for the Chinese, yet those with the lower cholesterol following the vegetable diet have no appreciable heart disease. So far he's described going from a high animal product diet to essentially a vegan one for all these reasons.
I'm sure some readers are wondering if veganism is compatible with competitive athletics and I am curious myself. Certainly I've been convinced we take in far more protein than we need for even vigorous athletics and have decided to dial my intake way down--at least till I finish the book

I have always told people that you can't go wrong with veggies and to a lesser extent fruits, and that we should ditch the processed foods completely. I may have to revise my feelings about animal intake and really slash mine. I don't know what I'm going to do without my chicken, fish, and skim milk though :/ I'm curious to see what others would do if convinced animal intake was correlated clearly with poor health outcomes, and to see if anyone else feels like tackling the book, which is an easy read.
Note: there's too much content to list and justify it all, even part way through the book. As it's written for the public, I have some issues with the presentation ("cholesterol"? do you mean HDL or LDL or total or what?? What are the exact p values and stats?). But that makes it accessible and it is extensively referenced, as well as written without an ax to grind. The guy is pro animal research, not a PETA nut, and he used to be a determined carnivore till confronted with his data. I will have to find out more about why there aren't more journal references rather than books generated by the China Study.