In my opinion, some of it, at least, is a maturing of the taste buds. All of our tastes change over the years. That's why kids hate cabbage, broccolli and fish but adults learn to like them (some do anyway).
I always had a sweet tooth but now seldom ever have a notion for a sweet or a cookie or even sugar in my coffee. It also never occurred to me, that it might be down to the MS as the change in taste happened long before my first flare.
Make do with sweet thoughts ....
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Multiple Sclerosis - A Personal Account