The claimed benefits of red wine are so frequently reported that they may seem to be a proven fact, and the critical voices do not get much notice. As usual for notions based on observational researches, we have a probable bias in the form of confounder.
Furthermore, in order to get a true shield to overcome cardiovascular disease you may need to drink so much every week that your brain and liver may be eventually damaged. In epidemiological studies, the dissimilarity in mortality between people who drink two glasses of wine per day and those who drink once a month is insignificant or non-existent.
Enthusiastic reports about resveratrol, a substance in red wine which prolongs life in mice that are fed high-fat/sucrose diets, sometimes forget to point out that the doses used correspond to more than 700 bottles of wine per day.