The China Study

The China Study, co-authored by T. Colin Campbell and his son Thomas M. Campbell II, presents findings from a large epidemiological project examining diet and disease across China. The book, first published in 2005, centers on the China-Cornell-Oxford Project, a joint research effort led by Campbell that surveyed populations in rural China and Taiwan during the 1980s, collecting data on diet, lifestyle, and mortality. Campbell argues that diets high in animal protein are linked to higher rates of chronic diseases such as heart disease, diabetes, and certain cancers, while plant-based diets are associated with lower disease risk. He describes laboratory experiments, including rat studies on aflatoxin and protein intake, that led him to conclude that casein, a milk protein, promoted tumor growth while plant proteins did not. The book outlines what Campbell calls the "principle of nutritional complexity," the idea that whole foods contain countless nutrients that work together, rather than single isolated compounds. Chapters trace the project's origins, the challenges of cross-cultural nutrition research, and the politics of nutrition science. Campbell critiques government dietary guidelines, the food industry, and what he sees as reductionist research that focuses on individual nutrients rather than whole diets. He also addresses low-carbohydrate and high-protein diet trends, arguing they conflict with his data. The book's conclusion recommends a whole-food, plant-based diet, minimizing processed foods and animal products. While widely cited by plant-based advocates, its methods and conclusions have drawn criticism from some nutrition researchers who question its causal claims and interpretation of the data.