The Secret of Feeling Full

In the best of all possible worlds, of course, you would just pop a few pills and lose all the weight you want. In our world, better medications will probably still work best in combination with a healthy diet and plenty of exercise. The promise of the new drugs, whenever they are developed, is that we won't have to fight with ourselves quite so hard to get a little healthier. And that could be an important first step.

--With reporting by Aisha Labi/London