Strange tastes in my mouth

Has anyone on a diet noticed strange tastes in your mouth? Like onions when I haven't had any or salt when I haven't had any? I noticed the salt taste when I was about 2 weeks in to my diet. And a couple of weeks ago, when I upped my protien and dropped the carbs noticed that my mouth tastes like onions even when I haven't had any. The flavor lasts for days.

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