1 What did the British doctors worry about? (Special Question)
2 Is fast food typical of the Americans' or British' diet? (Alternative Question)
3 Who advises young people to eat fat food? (Subject question)
4 British doctors advise young people to eat fat food to grow fast, don't they? (Disjunctive Question)
5 Do British doctors advise young people to eat fat food to grow fast? (General Question)