>snip
>In one of the author's animal
>studies it was found that a diet with 5 % of the total calories from
>protein lowers the activity of an enzyme that can convert aflatoxin
>into a toxic form that leads to liver cancer.
>On the other hand when the rats were fed with 20 % casein the same
>enzyme activity increased by 76 % resulting in an increased risk of
>cancer. Hence the author concluded that exposure to carcinogens may be
>less likely to cause cancer in a person whose diet contains a
>sufficiently low protein. The results suggest a low protein diet can
>also prevent toxins from entering cells, lowers the cell multiplication
>rate and protects against the formation of toxin-DNA adducts. He also
>mentions that the adequate percentage of protein for body growth is 10
>%. Dr. Campbell's team also found that hepatitis B virus, which is
>known to be a carcinogen that causes liver cancer, does not cause as
>much damage in rats which were given a diet with 5 % protein when
>compared to rats fed with a diet containing 20 % protein.
>snip