After thirty, a man’s testosterone levels start to decrease, this is natural but it gets worse with high stress or a bad diet. Buy grass-fed, organic meats to avoid the chemicals such as hormones that will affect your testosterone levels.

Some people who are born male and want to be female strive to lower their testosterone levels with certain foods such as mint, flax seeds and liquorice.

So here are some foods, activities and environmental issues to avoid that are scientifically proven to lower your testosterone production or have estrogenic properties. See also a detailed list of testosterone boosting foods.