I know, but every assumption that allows one to make the above statements is actually unproven.
- constant scarcity in historical environment
- inheritable biological "instinct" for eating a certain way
- rate of evolution of that instinct
- actual abundance in our current environment
People instinctively know what's healthy and what isn't. They just have no self-control to pick the healthier one over the unhealthy one.
No study ever has concluded that more information on labels helps people make better decisions.