Give a man a fish and you feed him for a day; teach a man to fish and you feed him for a lifetime. Teach a man to sell fish oil, and he’ll be able to pay others to catch, cook and serve the fish. The marketing and selling of fish oil has followed an all-too familiar path: The product promises health benefits. The studies can’t find those health benefits. And people still keep on buying the product anyway.

+ According to a recent study, people are more suspicious when things smell fishy.