Recent studies suggest that depression has a much greater impact on one's overall health than arthritis, diabetes, angina, and asthma. However, it's a disorder that often goes unrecognized and thus, untreated, says a report from the World Health Organization. Researchers studied 250,000 people in 60 countries and discovered depression was a greater predictor of ill health among patients. Also, those with arthritis, diabetes, angina, or asthma were more likely to be afflicted by depression than those without. Also, people with both depression and one or more of the chronic diseases studied reported the worst overall health.