I don't think the "too much sugar" crisis in the US is due to people cannot feel there is too much sugar. It's just overly sweet food is the default in so many parts of the US. Ice cream here is much sweeter than in Asia. Cup cakes in the US can send me straight to sugar coma after just one bite.

When I asked a friend if they thought the cup cake was sweet. They said that isn't cup cake supposed to be sweet? And they don't think it's overly sweet since all the cup cakes they have had were like that.