There must also be a genetic component to 'man boobs' as well because my dear hubby has them and when I see pix of him and his brother and dad from when he and his brother were teens, they ALL had em!!!
And being raised on a farm in the 60s, they consumed raw fresh milk [they raised cows], ate 'clean' meat, and all the other fresh farm things. Even grew their own veggies and canned produce! The point being, I doubt there was any or very little in the way of food, beverages or toxins that would have given them all this condition.