King Charles 'reluctant' to follow Queen Camilla's new rule

However, since his cancer diagnosis and subsequent treatment, King Charles now eats half an avocado with “some reluctance” to keep his strength up.

The Daily Mail claimed that Charles has now broken his lifelong habit of no lunch on orders from the Queen.

A source said: “With some reluctance, he now has something to eat at lunchtime – a snack, really.

“He now eats half an avocado to sustain him through the day.

"It’s important, particularly if you have got an illness.”

In April, the monarch's doctors allowed him to return to a managed schedule of engagements, two months after Buckingham Palace confirmed he had been diagnosed with cancer.

Clarence House revealed in 2018, in a list of 70 facts to honour his 70th birthday, that Charles “does not eat lunch”.

However, the addition of half an avocado is in keeping with the King's light and healthy diet.

He typically enjoys a light breakfast of fruit, eggs or muesli, with a helping of linseed, according to Tina Brown’s 2022 book The Palace Papers.

The monarch also prefers organic produce and previously told the BBC that he abstains from meat and fish on two days of the week, as well as excluding dairy on one of those days.

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His newest dietary addition of avocados is widely considered to be a “superfood” beloved by millennials and Gen Z, particularly when it is smashed on toast.

The fruit is full of fibre, essential nutrients and energy-boosting healthy fat.

Recent figures show that the fruit’s popularity is in the UK, with Britons buying 17.4 per cent more avocados in the year to April 2024 compared to the previous 12-month period, which marked the biggest rise for any fruit or vegetable.

The King’s stepson Tom Parker Bowles, a food critic and author, has confirmed the monarch eats a “simple, healthy” diet.