US researchers say they may have discovered why some people get a headache after just one small glass of red wine, even though they are fine drinking other types of alcohol. The University of California team say it is due to a compound in red grapes that can mess with how the body metabolises alcohol.
"The cheap grape varieties are grown on vines with very large canopies and lots of leaves, so they don't get as much sun," he said. "Whereas the high-quality grapes are from smaller crops with fewer leaves.
Several theories have been put forward to explain red-wine headaches, which can strike within 30 minutes of drinking even small amounts. Some have suggested the cause might be sulphites - preservatives to prolong shelf-life and keep wine fresh. Generally though, the sulphite content is higher in sweet white wines rather than reds.
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