Ex UFC champion Georges St-Pierre, 41.

He said: "I've never felt better in my life. I just wish I knew about it before.

"For so many years I used to follow the rules, eating three times per day, forcing myself to eat in the morning when I wasn't hungry.

"Since I discovered Intermittent Fasting I feel better by training with an empty stomach, feel sharper up here (mind), I feel more creative."

Crossfit supremo Rich Froning, 35.

He said: "I've found that it actually helps a lot with my inflammation, and it's increased my testosterone in about six months.

"This has actually helped. It makes me feel way better."

NFL star Ndamukong Suh, 35, who has never missed a game injured in 12 years.

He said: "When I started to take a holistic approach to my training, that’s when I saw big payoffs.

"I’ll start my days with bulletproof coffee ... in combination with intermittent fasting."

Pro golfer Phil Mickelson,52.

He said: "I believe fasting has been a big part of my ability to recover, to get in better shape; to eat less and to not be held hostage by food.

"Now I feel better when I eat less and I eat healthy, and I have more energy and better focus and mental clarity.”

 Mickelson became the oldest major championship winner in history after winning the PGA Championship in 2021.