Meghan Markle – now the Duchess of Sussex – is said to have persuaded the once-hard-partying Prince to replace alcohol and caffeine with still mineral water.
“Considering he’s been a pretty brutal drinker since he was a young teenager, it’s quite an achievement,” an insider told the Express.
“He was always fidgeting and on the go, always looking for the next thrill.
“He was a great laugh but it was always very full on.
“Now his new regime doesn’t make him the most entertaining party guest in the world, but he’s definitely more chilled and relaxed.”
Meghan has previously been outspoken about her approach to wellness.
Having grown up with a mother who was a yoga instructor – the approach is something she embraces.
"[The] practice is in my blood," she previously told Women's Health UK. "I love an intense vinyasa class—and even better if its blasting hip-hop and done in a dark room with candlelight. The best!"
Eating clean is also something Meghan loves to do.
"When I'm filming, I'm conscious of what I eat,” she previously told Best Health.
“I try to eat vegan during the week and then have a little bit more flexibility with what I dig into on the weekends."