Happens to me. I'm a junk food whore, so I'm always sucking on some sort of candy to appease my mouth.
It could be a myriad of things... If you know you don't drink enough fluids, remedy that (whether or not it has anything to do with this issue, you should always be hydrated!) Does it really matter why? Maybe it is correlated with your restricting, like your body is signaling the need for food?
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