Esley Alderman Nyt News Service

For most of us, the formula for losing weight is a simple one: eat less, exercise more. But humans are anything but simple, and the majority of Americans struggle endlessly with losing pounds and keeping them off.

For most of us, the formula for losing weight is a simple one: eat less, exercise more. But humans are anything but simple, and the majority of Americans struggle endlessly with losing pounds and keeping them off.