Did you know that certain things we eat and drink have a direct impact on libido and sexual responsiveness? In her recently published book, The Orgasmic Diet (Three Rivers Press, 2007), Marrena Lindberg (www.zaneblue.org) points out something interesting -- studies show that certain foods and substances that cause a spike in the neurotransmitter serotonin actually inhibit libido and sexual responsiveness ... in both women and men.

Serotonin is necessary for your health. But when not kept in balance with dopamine (another important neurotransmitter), sexual problems arise.

Here's the short list of serotonin-spiking orgasm killers:

• CAFFEINE. This one is probably no surprise, since we drink coffee and other caffeinated drinks for the buzz.

• GINGKO AND GINSENG. While touted as aphrodisiacs, these two do spike serotonin, which is a problem, especially for women.

• SMOKING. Nicotine may give you an initial burst of dopamine, but it wears off quickly, leaving you with a spike in serotonin that negatively impacts both your libido and your genital circulation.

• STARCH AND SUGAR. Studies have shown that when you eat starchy carbs and sugars, you raise your serotonin levels. So when eating these foods, pair them with foods containing protein, fiber, and/or healthy fats, which will offset the effect of the starch and sugar.

In my next entry, learn more about how to take your orgasm from zero to forty!