We spend more on health care than any other nation, but Americans aren’t necessarily healthier. The U.S. leads in medical research and sophisticated new treatments, particularly for cancer and heart disease. But Americans get steadily heavier as the years pass. Nearly one in five of us still smoke. Health care is jarringly expensive and is likely to get more so. Is there a doctor in the house? Amid debates over health care reform, healthy living, soaring costs and fancy new drugs and treatments, it’s a good time to face the facts.