For about a decade, some people eating pine nuts have reported a range of adverse effects collectively known as pine nut mouth or pine nut syndrome (PNS). Simply put, pine nuts appear to be leaving a bad taste in the mouth of some folks. The medical term for this is cacogeusia, or specifically metallogeusia, which is a perceived metallic or bitter taste. We have all tasted bad or spoiled food at some time, but the curious wrinkle to pine nut mouth is that it often appears days later, sometimes l…

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  1. Nuts and Seeds