As an active but long-term investor I believe in identifying long-term investment themes is a key element to success. One long-term trend that may offer investment opportunity is growth in global obesity. Just looking at the US a recent report by the Trust for America's Health and the Robert Wood Johnson Foundation says that since 1980 the adult obesity rate has doubled and rates for children have tripled. The report states that approximately 36% of adults are obese today and that percentage could grow to 44% by 2030 if the current trends continue. Obesity-related medical costs are forecast to rise by ...