I listened to his interview on NPR and it sounds terrifying. If he excerts himself too much, he gets drunk. If he eats carbs...drunk. Because his body made alcohol for so long, he had become an alcoholic even though he'd never had a drink. His alcohol dependence was so deep that he went through physical withdrawl, including the shakes, once he started treatment.
EDIT: Nobody believed him when he said he was not a drunk. Even his parents told his girlfriend (now wife) not to marry him. His wife believed him and is now a champion for the cause.