As much as 5% of breast cancer occurs in males, which 20 years ago was less than 1%. This is mainly attributed to estrogen-like compounds found in certain plastics and synthetic vinyls( avoid microwaving plastics), as well as traceable amounts of estrogens in the water supply( this was found during an investigation why so many animals were producing only female offspring- like alligators) and high levels of estrogen in cow's milk due to farmer's giving their cows bovine growth hormone( another reason why girls are hitting puberty so much earlier now along with huge increases in female breat cancer). This is also associated with increased levels of infertility and declining sperm counts in males.