Princess Diana ate this every day. "Overnight oats" are a perfect breakfast, even for those on a diet.

Thanks to its fiber content and valuable vitamins and minerals, oatmeal offers numerous health benefits. It lowers cholesterol levels, supports digestive health, and has a beneficial effect on brain function. When preparing this exceptionally healthy meal, it's worth taking inspiration from Princess Diana, who was a huge fan of so-called "overnight oats."

Princess Diana is still considered one of the greatest style icons. It turns out that not only Lady Diana's wardrobe can be a great source of inspiration, but also her diet, as discussed by former royal chef Darren McGrady.

The renowned chef worked for the British royal family from 1982 to 1997, initially creating menus for Queen Elizabeth II and Prince Philip at Buckingham Palace. In 1993, he became Princess Diana's private chef at Kensington Palace.

"Diana had regained control of her life during that time. She supported 119 different charities, worked out at the gym three days a week and looked absolutely stunning," McGrady said in a video posted on YouTube.

The author of the best-selling cookbook "Eating Royally: Recipes and Remembrances from a Palace Kitchen Cookbook " revealed the dish the Duchess was truly obsessed with: "overnight oats." The dish, which gained popularity over a decade ago, was enjoyed by Lady Di in the 1990s, further proof that the Duchess was effectively ahead of trends, including culinary ones.

"She went to a Swiss clinic and ordered Bircher Muesli cereal, which was the original recipe of a local dietitian. She stole the recipe, came back and said, 'Darren, I want to eat this for breakfast every day,'" the chef revealed.

To make the royal's beloved overnight oats, instead of cooking the oats in water or milk, soak them in freshly squeezed orange juice the day before and then refrigerate overnight. In the morning, add a mixture of Greek yogurt, honey, and lemon juice to the oats. The former royal chef recommends garnishing the whole thing with your favorite nuts and berries.

“It was so delicious that when I made it at Kensington Palace for Princess Diana, I made a second batch for myself,” McGrady added with a laugh.

Overnight oats actually have many benefits. According to nutritionists, they're a healthier alternative to the traditional, cooked version. Oats contain phytic acid, which reduces the absorption of minerals like iron, magnesium, zinc, and potassium.

Some studies indicate that soaking oats overnight can reduce the concentration of this acid by up to 37%. Furthermore, overcooking oats leaches out vitamins, especially B vitamins, and increases the glycemic index, increasing the risk of sudden spikes in blood sugar. Overnight oats are therefore an ideal breakfast, even for those watching their weight.