"Sucrose needs to be broken down first, and that can only happen at a limited rate."
This is generally true of everything we eat. Not just refined sugars. A simple rule, if we want to lose weight, is to include more minimally pre-processed foods in our diet...in other words, chew our own food. A hamburger from any of the drive-thru restaurants is basically chewed for us before we put it in our mouths. And this goes for cooking too. Eat raw foods and we burn more energy digesting, digesting slower and netting fewer calories. So a pound of carrots isn't always a pound of carrots. Not when you think about what happens inside your GI-tract.
P.S. I love BBQ. I am not advocating a completely raw food diet. However, maybe 30-50% raw, unprocessed foods combined with moderation in intake and making sure we get a wide variety of mostly plants will certainly improve the health of the normal North American (including me).