There's actually not that much evidence moderate sugar intake is bad for you, at all. All this talk about "sugar" swings is completely off base, IMO, especially considering most starches are much higher on the GI and II scales than sugars. Fructose is low GI, and most of it is converted to glucose in the gut, anyway. Higher consumption is converted to fat, but most vilifying sugars promote fat, so what's the differen…
There's plenty of evidence that foods in America are loaded with above-moderate sugar levels, so it's generally hard/expensive to receive moderate sugar levels.