1: Lisa Allen was thirty-four years old.  She had struggled with obesity since she was a child.  Lisa started smoking and drinking at sixteen.  She had moved from one dead-end job to another, never working for the same employer for more than a year.  She was $10,000 in debt and collection agencies were chasing her, writes Charles Duhigg in The Power of Habit.

After her husband fell in love … continue reading