Traditionally, no thought is given to adjusting a man’s hormones until he approaches middle age, when he may start having problems with erectile dysfunction. Compare this to women, who may start receiving hormones at the start of puberty. Does this mean that men’s hormonal well-being should be ignored until they develop sexual dysfunction? My answer to this, of course, is no. As is clear by now, I am a great believer in preventive medicine. Knowledge of hormones for men can help to prevent the onset of prostate cancer, diabetes, obesity, and heart attacks. Testosterone is a hormone produced by the...