Queen Elizabeth II and Meghan Markle
Meghan Markle could not eat her favorite potato and pasta meal in Buckingham Palace. Pictured: Markle and Queen Elizabeth II during a ceremony to open the new Mersey Gateway Bridge on June 14, 2018 in the town of Widnes in Halton, Cheshire, England. Getty Images/Jeff J Mitchell

Meghan Markle's food choices are limited when she's with the Queen.

The Duchess of Sussex could no longer eat several of her favorite food after she officially becomes a royal. According to a report, Markle could not eat her favorite pasta and potato meals when she's in the Buckingham Palace.

In an interview with royal chef Darren McGrady, he revealed that Queen Elizabeth banned pasta, rice and potatoes on her menu at Buckingham Palace. The Queen's carb ban is a personal choice. The monarch has stayed away from pasta and has never had rice or potatoes on the palace menu.

This means that Markle cannot eat potato and pasta when she visits the Queen. In a past interview with Delish.com, the new royal revealed that her go-to-meal is a pasta dish with slow-cooked courgette. The former "Suits" actress even described the dish as "filthy, sexy mush."

Aside from potatoes and pasta, Markle is no longer allowed to eat garlic. The members of the royal family are strongly discouraged from eating this.

"We can never serve anything with garlic or too much onions. The Queen would never have garlic on the menu," McGardy said.

Markle revealed earlier that her go-to-meal on set was season veggie quinoa with garlic. "At the start of each week, I generally cook a box of quinoa, and while it's simmering, I saute onions, garlic and any veggies I have on hand in a separate pan," the duchess said about her quinoa recipe.

Aside from limited food choices, Markle would have to follow a certain bedtime rule when she's with the Queen. According to Sir William Heseltine, the royals have to stay up late until the monarch decides that it's time to sleep.

There'd be an hour or so in the sitting room of everyone sitting around making conversation, and nobody felt it right to go to bed before the Queen did," Sir William said.

However, some members of the Firm couldn't keep up with it. According to Sir William, Princess Diana had broken the said rule several times.

"And Diana was driven to such extremes that she'd excuse herself and go to bed, which was thought to be rather bad form, going to bed before the Queen," he continued.