Low testosterone in men, also known as hypogonadism or low-T, refers to a condition where a man's body doesn't produce enough testosterone, a male sex hormone. If your body is lacking testosterone, your health and wellness can suffer drastically.

Testosterone is a hormone that influences sexual desire (libido) and the ability to achieve and maintain an erection. When testosterone levels are low, it can affect the body's ability to produce nitric oxide, a chemical that is necessary for erections. This can lead to difficulties in achieving and maintaining an erection. 

If you're putting on weight without a change in diet or exercise, low testosterone could be a key factor. Testosterone replacement therapy can contribute to a healthier body composition and support weight management.