Well off the top of my head: Americans are notoriously unhealthy — and just about everybody knows it. The World Health Organization (WHO) published a report earlier this year ominously titled, “U.S. Health in International Perspective: Shorter Lives, Poorer Health.” It found that Americans pay more money for mediocre health care, yet still suffer the consequences of sedentary lifestyles and poor eating habits. Nevertheless, there have also been a few recent reports suggesting that Americans are making positive health changes in their personal lives. And if that trend holds, it could foretell a seismic shift for the U.S. health care system. The latest bit of good news comes from a new survey conducted for the Pharmaceutical Research and Manufacturers of America (PhRMA). It found that 58 percent of American adults are now paying more attention to their personal health than they have in the past. Now, 57 percent of Americans are concerned with eating a healthier diet, 54 percent want to achieve a healthy weight, and 45 percent are vying to reduce stress in their lives.