The deadliest foods to be found on the stalls in street markets and the shelves of supermarkets, though, are not meat or poultry but leafy vegetables and fruit.

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Another Shanghai resident, Shao Linxia, said she would not longer be buying food from traditional markets, but instead using large supermarkets.

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Over the years, he has campaigned to keep markets alive and campaigned against too many supermarkets taking away their trade.

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Kombu is available at most Asian markets as well as some of the larger American supermarkets, such as Whole Foods.

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If you choose to add ginger, you could also add very small pieces of stem ginger in syrup (available at Asian markets and in the Asian foods sections of some supermarkets).

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Some of the best-performing food markets in the past few years have been convenience stores, and supermarkets are starting to notice.

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Critics also note that focusing on supermarkets means that the USDA ignores tens of thousands of larger and smaller retailers, farmers' markets and roadside greengrocers, many of which are excellent sources of fresh food.

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