Almost every cuisine Singapore serves will be sweeter relative to the authentic recipe. For example Korean food here is so sweet my wife thought she doesn't like Korean cuisine until she went to Seoul.

Japanese food is definitely healthier in many respects although there's still a lot of sugar hiding in sushi for example, and oyakodon, teriyaki and katsudon sauces are also often quite sweet.

Shabu shabu is better but so are most hotpots in a clear soup