Prior to T. C. Campbell's involvement with the China Study, he had conducted research concerning the effect of diet and carcinogen's with the development of cancer. In this study he exposed two groups of rats to the carcinogens aflotoxin and dioxin. Both groups of rats where exposed to these carcinogens. The study lasted 100 weeks. One group was feed a diet comprised of 20% protein and the other 5%.
At the conclusion of the study the group feed 20% protein based diet were all dead and the group feed 5% were all still living. Not only was the 5% group living but they were acting like young rats. This study would lead T. C. Campbell to other studies for the next 27 years that would deal with the effect of protein on cancer development. They also determined that when the rats went from a 20% diet to 5% it turned the tumor production off.
Rat Study 100 weeks
Protein %/Number of animals /Tumor Severity
5% / 60 / 248 (all living)
12% / 38 / 2358
20% / 58 / 3321 (all dead)
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