A glass with dinner now and then might help your heart, blood flow, or digestion, thanks to natural stuff in the grapes called antioxidants. But it’s still alcohol, and drinking too much can harm your body instead of helping it. Red wine is naturally rich in polyphenols, which act as antioxidants. Why alcohol science is so confusing This precaution extends to those planning to get pregnant and to those who are breastfeeding. Research suggests that polyphenols may offer protective benefits against metastatic cancers—or, cancers that spread from one organ to another. Specific types of polyphenols, such as resveratrol, quercetin, and lignans, have estrogenic properties and may protect against hormonal and esophageal cancers. Alcohol is classified as carcinogenic to humans by the International Agency for Research on Cancer. “Excessive or long-term…