Steven Reinberg of the Washington Post reports that two new studies in the American Journal of Preventive Medicine say Americans are eating far less fruits and vegetables than they should. According to a John Hopkins study, 62 percent of participants didn't eat any fruit daily. 25 percent didn't eat any vegetables, and "only 11 percent of U.S. adults meet the guidelines for both fruits and vegetables." Perhaps more troubling, a second study from Queens College compared intakes of vegetables, potassium and calcium from 1971 to 1974 and 1999 to 2002, and found that the diets of blacks has not improved compared to those of whites, numbers "not explained by race differentials in income and education." As one of the researchers said, a serious public health concern because "a diet rich in fruits and vegetables is associated with a lower risk of obesity and certain chronic diseases, such as cardiovascular disease, diabetes and some cancers."