WHEN it comes to travelling, Kate Middleton has strict rules to bear in mind – some of them related to enjoying the local cuisine.

With Queen Elizabeth deciding on the important set of rules all royals must follow when abroad, members of the Royal Family are allegedly banned from eating shellfish.

Due to it's relatively high risk of food-poisoning, it's ''a very sensible move to abandon having seafood when out and about on public duties,'' explained the renowned British etiquette expert, Grant Harrold.

"We don’t want a member of the Royal Family having a serious reaction to food poisoning.

"Especially if she is on an overseas tour,'' he told Woman & Home magazine.

The Queen's reported to notably abide by the guideline of not consuming shellfish and Kate and William also have to follow this rule during their trip to the Caribbean.

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Chef Matt Dean Pettit described the delicacy as "delicious" and explained: "The day before going on vacation with my family gave me the perfect opportunity to dream of all the delicious shellfish I was going to cook up once I got home!"

However, despite the strict set of rules, it is rumoured that Prince William is a fan of sushi and Prince Charles was once seen indulging in seafood during an official trip.

Unlike her relatives, the Queen is said to refuse to eat oysters as she dislikes the delicacy.

''Inevitably there are one or two things the Queen and her husband do not like, and the hosts are duly warned in advance,'' the former royal servant Charles Oliver wrote in in the book Dinner at Buckingham Palace.

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"The palace instruction states only: 'Neither the Queen nor the Duke of Edinburgh like oysters."

As well as sharing a dislike for oysters, the Queen also hates garlic – a common favourite that is banned in the Palace.

“We can never serve anything with garlic or too much onions,'' revealed Royal chef Darren McGrady.

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''At Buckingham Palace you don’t cook with garlic. I suppose, in case you get the royal burp,'' said John Higgins, another former chef, to the National Post.

Other foods that can also not be found in the Royal kitchen during dinner time include potatoes, rice and pasta.

''When she dines on her own she’s very disciplined,'' McGrady described the Queen.

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