An article in the Journal of Agricultural and Food Chemistry asserts that drinking wine may actually help prevent sunburns. According to the study, the flavonoids present in grapes can stop the chemical reaction that causes cells to die, which is what causes skin damage. The study was conducted in vitro in a laboratory by the University of Barcelona and the Spanish National Research Council.
Grapes, therefore, can help protect from sunburn and even skin cancer, says the director of the research project. Cabernet Sauvignon skin cream, anyone?
Note: This study doesn't change the fact that drinking wine can make your face red, or that if you drink wine in the sun you might fall asleep, and thus get sunburned anyway.
UPDATE: The study may be too good to be true. A blog post written by a PhD student in Medical Sciences and Molecular Pharmacology explains, "The research paper discusses potential topical applications for these extracts (putting these concentrated extracts on your skin) NOT benefits from eating grapes or drinking wine." Also see this blog post for another explanation.