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The Habit Cure She was the scientists’ favorite participant. Lisa Allen, according to her file, was thirty-four years old, had started smoking and drinking when she was sixteen, and had struggled with obesity for most of her life. At one point, in her mid-twenties, collection agencies were houndi…

The Habit Cure She was the scientists’ favorite participant. Lisa Allen, according to her file, was thirty-four years old, had started smoking and drinking when she was sixteen, and had struggled with obesity for most of her life. At one point, in her mid-twenties, collection agencies were hounding her to recover $10,000 in debts. An old résumé listed her longest job as lasting less than a year. The woman in front of the researchers today, however, was lean and vibrant, with the toned legs of