If my high school chemistry is still with me, sucrose is a disaccharide and is made up of the monosaccharides glucose and fructose.
I don't remember all the biochemical pathways, but eventually if your body needs to burn energy, everything sooner or later gets converted to glucose, that includes fat, proteins, and starch.
Your body does use ketones under conditions of starvation (I think that's from fat or proteins, but I'm don't remember the exact details).
Fruits are beneficial for you, but I think that has more to do with ingesting all those fibers and vitamins found in the fruits, not with consumption of sucrose.
Common table sugar, the one that is derived from either cane or beet, is sucrose.
Again, I think the problem is more with excess calories than anything else.
And let me just make one thing clear. I started this thread advocating the drinking of Coca-Cola made with REAL sugar, NOT with high fructose corn syrup. And I stressed again and again like everything else, we should drink coke made with REAL sugar with moderation.
I can bet you 150Kcal of coke made with real sugar wont cause you anymore health problems than what you already have.