I Ate My Diet at Lunch Time

Miss Brown was very fat.She weighed 100 kilos,and she was getting heavier every month,so she went to see her doctor.

He said,"You need a diet,Miss Brown, and i've got a good one here." He gave her a small book and said, "Read this carefully and eat the things on page 11 every day. Then come back and see me in two weeks time."

Miss Brown came again two weeks later,but she wasn't thinner,she was fatter. The doctor surprised and said, "Are you eating the things on page 11 of the small book ?"
"Yes,doctor." she answered

The next day the doctor visited Miss Brown during her dinner. She was very surprised to see him.
"Miss Brown," he said , "Why are you eating potatoes and bread? They aren't in your diet."

"But,doctor," Miss Brown answered," I ate my diet at lunch time.This is my dinner."(M²N Collection)

Can you find the funny thing from the story ?Leave your comment :)