Tagatose and psicose are amazing -- tagatose, in fact, tastes better than sugar (the sweetness level is similar, gram for gram, but it's smoother, somehow "cooler," and has absolutely zero aftertaste,) and psicose bakes and browns exactly like real sugar.

The trouble is that they seem extremely expensive to make and sell, so they're not terribly viable as mass-market sugar replacements, and few people are even aware they exist.

There was a tagatose-based sweetener available called "tagatesse" which was unbelievably good, but it was withdrawn from the market about a decade ago. It resurfaced some time ago, but they changed the formula and it now contains a lot of sucralose...

Anyway, to the point, there's lots of evidence to suggest that tagatose and psicose are actively healthy. They inhibit alpha-glucosidase, stimulate the release of GLP-1, boost glycogen storage in the liver, and are highly fermentable by beneficial gut bacteria. Definitely healthier than sugar.