Dairy consumption promotes excess estrogen in the body due to it containing estrogen from female cows. It can account for up to 80% of dietary estrogens if someone is drinking a lot of it. This is not good since excess estrogen from any source has been linked to an increase risk of female cancers. Men aren’t off the hook though. They are more at risk for developing testicular and prostate cancer when they have excess estrogen in their bodies. This hormonal imbalance can also cause mood swings and lead to unwanted reactions like acne.