I think you get a stronger message if you can just say, sugar is bad, fat is bad. But you might get a truer message if you say, "sugar is bad when added in this dietary context, fat is bad when added in that dietary context." Sugary, low-fat snackwell cookies get a bad rap, and deserve it, but I don't think full-fat oreos made with pastured lard would be that much if any of an improvement. Back when I let the food industry make my ice cream, I could just as easily go through a couple of liters of high fat ice cream as low fat ice cream, in that context the fat didn't slow me down any. I might have only been eating that much fat because of the sugar added, so you could say the trigger was the sugar, that doesn't mean that the excess intake of fat wasn't harmful as well.