Get headaches from drinking red wine? New research explores why.

Red wine may be on your Thanksgiving menu, but for some people, even a small glass can result in a headache. Now researchers say they may have figured out why.

In a new study, published in the Scientific Reports journal on Monday, scientists at the University of California, Davis, found the culprit may be a flavanol that occurs naturally in red wines and can interfere with the proper metabolism of alcohol. Flavonols are a group of compounds found in many plants.

The flavanol, called quercetin, is naturally present in grapes and other fruits and vegetables and is considered a healthy antioxidant. However, when metabolized with alcohol, issues can occur.