Reward for virtue

My friend, Hugh, has always been fat, but things got so bad recently that he decided to go on a diet. He began his diet a week ago. First of all, he wrote out a long list of all the foods which were forbidden. It contain most of the things Hugh loves: butter, potatoes, rice, beer, milk, chocolate, and sweets. Yesterday, I paid a visit. I rang the bell and was not so surprised to see that Hugh was still as fat as ever. He led me into his room and hurriedly hid a large parcel under his desk. It was obvious he was very embarrassed. When I asked him what he was doing, he smiled guiltily and then put the parcel on the desk. He explained that his diet was so strict so he had to reward himself occasionally. Then he showed me the contents of parcel. It contained five large bars of chocolate and three bags of sweets.

Why did Hugh』s diet not work?

New words:parcel包裹 forbidden禁止 embarrassed尷尬 strict嚴格的 occasionally偶爾地