Until recently, it was unclear why this was the case, with former royal chef Darren McGrady telling the Telegraph rather cryptically that royals were not permitted to eat certain foods in public, such as shellfish and foie gras (goose liver pate), because they were too “risky.”

This has been interpreted in a variety of ways, with some believing that the prohibition on ‘risky’ shellfish is due to their reputation for causing food poisoning if not cooked properly or are not fresh.

Former royal butler and etiquette expert Grant Harrold later confirmed this, telling Express.co.uk: “When dining, the Royal Family has to be careful with shellfish due to shellfish poisoning, due to their work schedules.”

“As a result, you won’t normally find this on the royal menu.”

Queen Elizabeth II has a list of foods that have been passed down through family members, with the warning that they should not be eaten while travelling or attending state functions.

While some of these reasons are to avoid “mess” and embarrassingly stinky breath, others have a more serious reason for being removed from the menu.

Author Peter Pigott revealed in his 2005 book Royal Transport that lobster is no longer on the menu.

He claims that the reason for this is more about good health than personal taste.

“She does not like shellfish or lobster, according to women’s magazines,” the author wrote. “It’s more of a precaution against stomach upset than a personal preference.”

In a similar vein, Royal Family members are advised to avoid eating rare meats and drinking tap water.

Indeed, these are foreign foods that, in unfortunate circumstances, can cause tummies to gurgle.

However, the BBC reports that the Queen also prohibits some dinnertime favourites for less life-threatening reasons.

While spaghetti and tomato pasta is one of Italy’s most popular dishes, her Majesty removed it from any of her personal menus in 2000.

Chefs at the Italian palace where the Queen and her husband were staying were also instructed to refrain from using garlic in any dishes.

Spaghetti and tomato sauces are deemed “messy,” and may endanger the Monarch’s appearance while dining.