We know that consumption of animal products cause cancer and that a plant based diet is treating it:
Women fear breast cancer above all other health problems. Fortunately,
this is a preventable disease with the right diet and a healthy
to what most people hope for, early detection by mammography causes
more harm than good. Radical surgery, radiation, and chemotherapy are
brutal remedies universally prescribed to women with breast cancer, yet
they provide little, if any, survival benefit. Hormone manipulation is
of some value. However, the best, and most overlooked, approach for
treating breast cancer is the McDougall Program – a plant-food based,
low-fat diet with added exercise."
A very informative movie: http://www.adelicatebalance.com.au/
The correlation between eating animal products and cancer is backed up in the links I provided, in this: http://www.thechinastudy.com/ ; and more research.
No, everyone doesn't get cancer that eat animal products.
There is also a strong correlation between heart attacks and coronory disease and the consumption of animal products: http://www.youtube.com/watch?v=EqKNfyUPzoU
And one can get completely out of the risk-zone by eating a healthy vegan diet without processed foods and Oils.