I'm not a dry Presbyterian, but I think a lot of those studies are encouraged by the liquor industry.
Red grape juice does the same thing for our arteries.
More than two drinks a day raises the odds for all kinds of invasive diseases.
That's why I stick to no more than 1/2 to 1 glass of red wine every other day or so. Believe it or not, it was recommended by my doctor to lower my blood pressure. He also recommended a twenty minute walk each day.
I took the first half of his advice "religiously", and the latter half a bit less heartedly. However, it worked quite well.