Austrian researchers found that exposure to bright light increases testosterone levels and leads to greater sexual satisfaction in men with low sexual desire. According to Sciencedaily.com, low sexual desire affects up to 25% of men over 40. Another group of scientists have tested sexual and physiological responses to bright light. They found that regular, early-morning, use of a light box – similar to those used to combat Seasonal Affective Disorder – led both to increased testosterone levels and greater reported levels of sexual satisfaction. The scientists, led by Professor Andrea Fagiolini, ran a study where men low sex drive were treated early in the morning, with treatment lasting half an hour per day. After two weeks of treatment or placebo, the researchers retested sexual satisfaction and testosterone levels. Professor Fagiolini says, "We found fairly significant differences between those who received the active light treatment, and the controls. The researchers found that testosterone levels increased in men who had been given active light treatment. Professor Fagiolini explains: "The increased levels of testosterone explain the greater reported sexual satisfaction. The researchers explain that bigger studies are required and that the bright light treatment depends on the underlying cause, but current therapeutic options include testosterone injections, antidepressants, and other medications. The researchers believe that light therapy may offer the benefits of medication, but with fewer side effects.
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