Testosterone is a hormone that, in men, is primarily made in the testicles, in women, the ovaries, though in much smaller amounts.

Testosterone affects bone and muscle mass, the way men store fat in the body, and even red blood cell production. A man’s testosterone levels can also affect his mood.

While testosterone production naturally tapers off as a man ages, other factors can cause hormone levels to drop, and one of those factors is obesity.

Obesity often inhibits a man’s sexual desire is because increased body fat in a man leads to more sex hormone binding globulins (SHBG) in the system.

SHBG is a natural chemical that binds to testosterone, which means there’s less of the sex hormone left to handle the demands of a normal sex life.