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What should we do? One option is to do nothing, while hoping that scientists find better cures for obesity-related diseases like heart disease and Type 2 diabetes. I’m not holding my breath for such cures, and the costs of inaction, already staggering, would continue to mushroom.

A more popular option is to enhance public education to help us make better decisions about what to eat and how to be active. This is crucial but has so far yielded only modest improvements.

The final option is to collectively restore our diets to a more natural state through regulations. Until recently, all humans had no choice but to eat a healthy diet with modest portions of food that were low in sugar, saturated fat and salt, but high in fiber. They also had no choice but to walk and sometimes run an average of 5 to 10 miles a day. Mr. Bloomberg’s paternalistic plan is not an aberrant form of coercion but a very small step toward restoring a natural part of our environment.

It is going to take regulation to get us to a more natural state. So are we evolving or devolving?