Nothing is ever as simple as we think it should be. And finding out that something isn't simple is pretty constant. Folk medicine is a source of starting places sometimes, but without the testing methods and instrumentation, the reasons that folk remedies work or don't work is usually complicated and requires a lot of unraveling. These papers include a lot of information that allows food scientists to unravel the truth faster, if they are careful and don't assume the unassumable.
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