Page "Casein" Paragraph 21

T. Colin Campbell's The China Study ( 2005 ), a book about one of the largest nutritional studies ever conducted, describes a direct correlation between casein administered to rats and the promotion of cancer cell growth when exposed to carcinogens.

Aflatoxin ( a potent carcinogen ) was administered to these rats over a 2 week dosing period.

The rats were given a 1 week post-dosing period before beginning the test ( promotion period ).

During the promotion period, one group of rats was put on a 5 % casein protein diet and another group on a 20 % casein protein diet.

None of the rats on 5 % casein protein developed foci, precursors to cancerous cell growth, and every rat on 20 % casein protein developed the pre-cancer foci.

It should be noted that all test groups were fed a 20 % casein diet for a total of 5 weeks ( 2-wk acclimation, 2-wk dosing, 1-wk post-dosing ) prior to the 12 week promotion period in order to survive the initial aflatoxin B1 ( AFB1 ) dosing, regardless of whether they were in the 5 % or 20 % test groups.