I see it more as a manifestation of the fact that things are never as simple as they appear. As we start to look deeper into how our bodies work we're finding that the situation with regards to sugar/salt/fat/gluten/<anything else> is more complex than we realised. These things aren't inherently _bad_, but if we abuse them then we end up with side effects that can be disastrous. The key, as ever, is understanding the effects and treating everything we eat with appropriate respect.