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    Former Royal Chef Reveals Diana Accused Him of "Poisoning" Her With One Food During "Blotchy" Trooping the Colour Disaster

    Fortunately, Kensington Palace had a secret in-house solution at the time.

    Kristin Contino's avatar
    By Kristin Contino
    Published 22 July 2026 In News

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    Princess Diana, Prince Harry and the Queen Mother riding in a carriage
    (Image credit: Getty Images)
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    Former royal chef Darren McGrady experienced his fair share of hilarious moments while working in the kitchens at Buckingham Palace and Kensington Palace, but one juicing incident might just take the cake. McGrady, who spent 11 years cooking for Queen Elizabeth before moving over to work for Princess Diana, says that Diana had a penchant for healthy eating, but one idea ended in disaster when she didn’t take his advice.

    Speaking on behalf of Smooth Spins Casino, McGrady says that Princess Diana loved to eat “fresh and clean” meals like “a peach and feta salad with walnuts.” She also was a huge fan of fresh juice, and the former royal chef says Diana “was juicing before juicing was even invented.”

    After Diana asked McGrady to buy a juicer, he started making “fresh orange juice every morning” for the princess, he recalls. “Then, after that, she would have a green drink mid-morning. That would be spinach, celery, cucumber and apple juice. She would have that religiously every morning.” However, one type of juice didn’t quite agree with the princess.

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    Princess Diana wearing a black dress sitting at a dinner table

    Princess Diana is pictured at a 1996 charity dinner.

    (Image credit: Getty Images)

    Darren McGrady posing in a chef coat

    Darren McGrady served as a chef at Buckingham Palace and Kensington Palace.

    (Image credit: Getty Images)

    “One day, she came in and said, ‘Darren, I want some beet juice. I’ve heard that beetroot juice is healthy,’” McGrady shares. However, he even though he warned her that it needed to be diluted with another type of juice, Princess Diana insisted on straight beetroot juice only.

    “A few hours later, she came into the kitchen and said, ‘Darren, you’ve poisoned me! Look at my face, it’s all blotchy,’” McGrady shares. “I told her it could have been the overdose of beetroot juice.”

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    Unfortunately this happened right before Trooping the Colour, but McGrady says that Diana solved her splotchy face situation with a fresh tan and some heavy-handed foundation.

    Princess Diana, the Queen Mother and Prince Harry in a carriage at Trooping the Colour 1992

    Princess Diana, pictured with the Queen Mother and Prince Harry, attend Trooping the Colour 1992.

    (Image credit: Getty Images)

    “She went onto the sunbed, which we had at Kensington Palace back in the day, got a little bit of a tan and put on loads of makeup,” he recalls. “Thankfully, no one noticed when she went out on the balcony for Trooping, and no one picked up on it.”

    Marie Claire Newsletter

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    “That worked fine, but after that she listened to me when I told her about juicing, what we could use and what we couldn’t,” McGrady shares.

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    Kristin Contino
    Kristin Contino
    Senior Royal and Celebrity Editor

    Kristin Contino is Marie Claire's Senior Royal and Celebrity editor. She's been covering royalty since 2018—including major moments such as the Platinum Jubilee, Queen Elizabeth II’s death and King Charles III's coronation—and places a particular focus on the British Royal Family's style and what it means.

    Prior to working at Marie Claire, she wrote about celebrity and royal fashion at Page Six Style and covered royalty from around the world as chief reporter at Royal Central. Kristin has provided expert commentary for outlets including the BBC, Sky News, US Weekly, the Today Show and many others.

    Kristin is also the published author of two novels, “The Legacy of Us” and “A House Full of Windsor.” She's passionate about travel, history, horses, and learning everything she can about her favorite city in the world, London.

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