Trouble brewingA 20-year study conducted by U.C. San Francisco researchers demonstrated alarmingly disproportionate results between whites and blacks when it comes to developing heart failure by age 50. Of the 5,115 subjects in the study, 27 developed heart failure by the time they were in their mid-40s, with the average age being 39. Of those, 26 were black. So, while the roughly 1 percent rate of heart failure for blacks in the study may sound low -- it's 20 times higher than whites' rate. "Th