Of course there's lots of sugar in donuts or ice cream, or pastries, or other things that are sweet; candy of course, but there are other places where you see it and you don't necessarily expect it.
For example, your doctor may recommend that you suck on a piece of sugar-free candy or chew sugar-free gum to relieve dry mouth, and use eyedrops to keep your eyes moist.
It begins with the sugarcane pulp, which is processed into various forms: from the liquid sugar used to make soft drinks, to the more syrupy sugar used to make hard candy, VHP sugar for exportation, refined and granulated sugar.
No, really, Lifesavers are now made in Canada because they can buy sugar at that lower world price and then import the candy without paying the sugar duty.