Issues may include lifestyle choices, such as smoking or an unhealthful diet, and health conditions, such as diabetes or depression. According to an article in the Journal of the International Society of Sports Nutrition, diets that are high in protein, especially relative to carbohydrates, may raise testosterone levels. An article in Nutrients indicates that a low protein diet may damage the Leydig cells that produce testosterone in the testes. Learning that your testosterone is low can be unsettling, but it’s not a reflection of virility or “manhood” at all. Speak to your doctor about your treatment options, but a few lifestyle changes may be all you need to re-energize, body and spirit.