Caffeine is the most widely used drug in the world today. If you're one of the many people with this daily habit, here's a piece of good news: You don't have to quit. In fact, as caffeine serves to arouse the nervous system, boost the metabolic rate, and increase blood flow, moderate consumption (defined as two cups or about 200 to 300 mg per day) may offer some benefits to sexual fitness. A small study of older men indicated that coffee enhanced their sex lives by providing them with extra energy.
However, you should limit your intake to no more than two cups of coffee or four cans of caffeinated soda a day. At doses any higher than that, caffeine can alter levels of sex hormones and may cause some serious physical and psychological problems. For women, heavy caffeine intake is associated with a significantly increased risk of ovarian cancer and endometriosis. Also, studies indicate that caffeine intake is correlated with severity of PMS symptoms: the more caffeine women consume, the worse the PMS. In both men and women, heavy caffeine consumption can cause anxiety, restlessness, nervousness, insomnia, lack of focus, and gastrointestinal disturbances.
The bottom line for caffeine drinkers is moderation. It seems that consuming fewer than two cups of coffee or four cans of soda a day will do you no harm, and it may just give you a needed energy boost at times when you're feeling too tired to play. However, once you exceed that limit, you put yourself at risk for health problems. So enjoy your daily dose of caffeine, but remember to take it easy.