Most Milk producers treat their dairy cattle with rBGH or rBST ( recombinant bovine growth hormone ) to improve their milk productions, however it also increases udder infections, and pus in the milk. It leads to higher levels of a hormone called insulin-like growth factor ( IGF-1 ) in the milk. High levels of IGF-1 may contribute to breast, prostate, and colon cancers. When the government approved rBGH, it was thought that IGF-1 from milk would be broken down in the human digestive tract. As it turns out, the casein in milk may protect most of it, according to independent studies. This is not 100% proof that this is increasing cancer in humans, but it is banned in most industrialized countries.

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