We have a perception that if we belong to the Royal Family, we could eat anything and everything we want. But think again.
There are some major restrictions when you belong to the Royal Family and this includes a restriction on food as well. According to various reports that have come out, the Royal Family is not supposed to eat Shellfish.
This is apparently due to the risk of food poisoning that comes with the Shellfish. The family is also advised about staying clear of tap water when abroad.