The one exception is wine rich in either resveratrol or trans-resveratrol, which has been shown to inhibit aromatase (the enzyme that turns testosterone into estrogen), thereby lowering estrogen levels. For example, a study that was just published showed that red but not white wine acted as an aromatase inhibitor and resulted in lower estrogen levels after one month in premenopausal women. The group of women that drank eight ounces of red wine daily had higher testosterone and lower estrogen levels than the group that drank white wine daily. Previous studies have shown that red wine appears to lower overall cancer risk, and it provides cardioprotective effects along with increasing insulin sensitivity.