There's one food Meghan Markle is banned from eating when travelling now that she's a royal.

There comes a point when the barrage of royal rules associated with being a Duchess overrides the fancy tiara-wearing, palace-living perks.

And we think we’ve found the rule that has done so.

According to the Sunday Express, when it comes to her official travelling diet, Meghan Markle will no longer be able to eat anything cooked with garlic; a food which the Queen is also said to hate.

This is to make sure a member of the British royal family doesn’t bomb a travelling diplomat with a burst of pungent breath.

Goodbye garlic bread, goodbye seafood pasta, good bye hummus. Image: Getty.

Speaking to Recipes Plus, Darren McGrady, who has 15 years of experience working in the kitchens of Buckingham Palace and Kensington Palace, confirmed the claim.

"We can never serve anything with garlic or too much onions," he said. "We also couldn't serve meat that was rare, as she liked her meat more well done."

Similarly, Carolyn Robb, who cooked for Prince Charles, Princess Diana, Prince William and Prince Harry from 1989 to 2000, said she had to abide by the rule too.

"The only thing that was forbidden was garlic," she told Racked in 2015. "The reason for that was that they obviously did a lot of public engagements and were in close proximity to people and never wanted to have garlic."

When in private, the Duchess of Sussex can eat as much garlic bread, hummus and garlic prawn pasta as she likes. But it seems like the root vegetable joins the likes of shellfish as a no-go zone at royal dinner parties.

And frankly, we're not sure if all the royal titles and fancy outfits could make up for that loss.

RIP garlic.

We count all the many reasons why we love Meghan Markle. Thank you for being a Wonder Woman.