Has anyone ever experienced a situation where you suddenly lose all taste for a certain food or beverage?

I was diagnosed with diabetes in 2006 and from then on, I switched to Diet Coke as the only soda I drink and I usually drink only one or two cans a day. As of about 2 months ago, whenever I drink Diet Coke whether it be from a can or as a fountain drink (like when it is served in a restaurant), I can’t taste the flavor of it at all. I perceive a sweet taste sensation but that is it. I haven’t had this happen with any other beverages that I drink.

I was just curious as to why this might occur and what things might cause it to happen.