(UPI) - U.S. researchers say an ingredient in red wine, resveratrol, may prevent the negative effects that spaceflight and long exposure to zero gravity have on people. A report in the journal of the Federation of American Societies for Experimental Biology describes experiments in rats that simulated the weightlessness of spaceflight, during which one group fed resveratrol did not develop the insulin resistance or loss of bone mineral density seen in the group that was not fed resveratrol.