This keeps getting better and better: a team of researchers found that ethanol (i.e. alcohol) increases the level of antioxidants in berries. The study did not indicate whether or not other fruits were affected by treatment with alcohol.
So between these two studies, we can safely conclude that dark chocolate brownies with Gran Marnier-soaked strawberries and raspberries is probably about the healthiest food out there. Extra points if consumed with a red wine sangria. Yay!