In extreme moderation nothing is unhealthy. One drink a week, one cigarette a weak, a teaspoon of sugar a day or one fruit a day are all perfectly fine.
Overconsumption is unhealthy.
Fructose is more unhealthy than glucose because glucose is absorbed by your whole body and fructose by your liver.
Liver is small so it's easier to over tax it. Just like a car engine will fail faster if you drive at max speed all the time, your liver will stop working well if you constantly overload it with processing fructose.
Fructose turns into fat which is deposited in your belly (you get fat / overweight) and in your liver, which is worse.
It leads to fatty liver disease i.e. the fat prevents optimal liver functions which leads to insulin resistance, type 2 diabetes and other metabolism / autoimmune issues. You're more likely to catch a flu or die from covid.
https://www.vegetariantimes.com/health-nutrition/nutritionis...
Instead I’ll drink a latte (lactose) or eat something like a gummy bear (glucose).
I actually wish someone would make 100% glucose lollies with no added sucrose, but they all seem to have some.