eat too much will increase the possibility of cancer

If men eat too much,will result in inhibition of genes which can lower activity of cancer,increasing the possibility of cancer.
An investigation to 58 men with gastric cancer for their eating habits and appetite before cancer found that answer is "quite enough to eat" and the answer is "proper control of appetite, eating only eighty percent full" compared to the people,eating more people have taken place in the cell-methyl (methyl) of the chemical reaction, the cells lose their ability to campaign. The survey also found that green tea drink, eat cabbage can inhibit the occurrence of methylation.
The research team also found that in experiments,when the catechins contained in green tea (catechin) were injected into the cells,some phenomenon of methylationthe for genetic has been the controled,and eventually disappear.But why eat too much causes cells rise to methylation, and to eat cabbage can inhibit methylation,remains a mystery.