Miss Green is very fat. She weighs 100 kg and she is getting heavier and heavier every day. So one day she goes to see the doctor. The doctor says,"You need a diet, Miss Green, and I have a good one here." He gives her a small book and says, "Read this carefully and eat the things on Page 11 every day. Then come back and see me in two weeks' time." Miss Green comes back again two weeks later. She isn't thinner. She is fatter instead.  The doctor is surprised and says, "Are you eating the things on Page 11 of the small book?" "Yes, doctor." she answers. The next day the doctor visits Miss Green during her dinner. She is surprised to see the doctor. "Miss Green," he says, "why are you eating potatoes and bread? They aren't on your diet." "But, doctor," Miss Green answers, "I ate my diet at lunchtime. This is my dinner." Potatoes and bread can make people  _  .
well thin fat ill