It seems like we really don't actually know. Sugar and trans-fats are the only things everyone can agree is bad, and it's not even totally clear whether sugar

It seems like we really don't actually know. Sugar and trans-fats are the only things everyone can agree is bad, and it's not even totally clear whether sugar is actually that bad for people who aren't overweight and aren't sedentary (although most people are overweight and sedentary now anyway so it may not matter). (Even fiber, for example, might not be that important in itself so much as it is simply a proxy for vegetable consumption considering that fiber supplementation does nothing.)