Will public-health warnings, combined with media pressure, persuade people to get dinner, just as they finally put them off tobacco? Possibly. In the rich world, sales of healthier goods are booming and new figures suggest that over the past year Americans got very slightly thinner for the first time in recorded history. But even if Americans are losing a few ounces, it will be many years before the country solves the health problems caused by half a century's dining to excess. And, everywhere else in the world, people are still piling on the pounds. That's why there is now a consensus among doctors that governments should do something to stop them.

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