A woman went to her Doctor to ask him for advice on dieting.
'I have this new diet which is very simple' said the Doctor. It will take you three days. On the first day eat only meat, on the second day eat only vegetables and skip the third day.'
Four days later the woman returned.
'How did you get on with the diet?' asked the Doctor.
'I was OK for the first and second day' she replied 'but I found the third day exhausting. I couldn't skip all day.'
