Why do some pine nuts cause a bad taste in your mouth that can last for weeks? The reason I make pesto with walnuts instead of the more traditional pine nuts isn’t only because walnuts are probably healthier with 20 times more polyphenols, but also because of a mysterious phenomenon known as PMS. Not that PMS. Pine mouth syndrome is characterized by what has become my favorite word of the week: cacogeusia, meaning a bad taste in your mouth. You can get cacogeusia from heavy metal toxicity, seafood toxins, certain nutritional and neurologic disorders, or the wrong kind of pine nuts. “Termed ‘Pi...

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