http://well.blogs.nytimes.com/2016/01/08/ask-well-health-benefits-of-red-wine-vs-grape-juice/?emc=edit_tnt_20160109&nlid=59279641&tntemail0=y
The relevant paragraphs;
We keep hearing about the benefits of drinking red wine. Why not grape juice instead? It has the same benefits, plus no alcohol.
Reader Question • 60 votes
A
Red wine is probably
better for you than grape juice because the fermentation process
involved in making wine changes the makeup of the juice, and the skin of
the grape, which is loaded with healthful antioxidants, is more likely
to be used in the winemaking process, said Dr. Antonia Trichopoulou, a
professor and director of the World Health Organization Collaborating
Center for Nutrition at the University of Athens School of Medicine in
Greece.
The color of the wine
indicates how many healthful nutrients known as polyphenols the drink
contains. “Red has more than white, and white more than beer,” said Dr.
Miguel Ángel Martínez González of the University of Navarra in Spain.
Red wine also contains alcohol, and many observational studies have
shown that drinking alcoholic beverages in moderation reduces the risk
of coronary heart disease, he said, by increasing levels of healthy HDL
cholesterol and reducing the clumping of platelets that can lead to
clots inside blood vessels.
A compound that may be
responsible in part for wine’s health benefits, called resveratrol, is
also present in grape juice. But it’s almost impossible to tell how much
there is in a particular glass of wine or grape juice, and naturally
occurring levels of resveratrol may be too low to have a pronounced
effect on health, said Leonard Guarente, who studies the biology of
aging at M.I.T.
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