John Goodman shows off incredible 90kg weight loss transformation

John Goodman stunned onlookers on the red carpet of his hit HBO show with the very dramatic results of all his recent hard work.

Roseanne star John Goodman has hit the red carpet for his popular HBO series, The Righteous Gemstones, showing off the impressive results of his health and fitness overhaul.

The 70-year-old Roseanne star attended the third season premiere at the 62nd Monte-Carlo TV festival on Sunday after shedding a huge 90kg from his frame.

Goodman showed off his body transformation at the TV festival. Picture: Pascal Le Segretain/Getty Images

He was serving as jury president at the event. Picture: Valery Hache/AFP

Goodman, who recently opened up about his new series – streaming locally on Foxtel – in an interview with news.com.au, has previously explained that he realised he needed to make changes after tipping the scales at his heaviest weight of 178kg.

The actor looked pleased with his results as he walked the red carpet in a fitted suit jacket and beige trousers ahead of the festival, where he was also serving as jury president.

Stream all the seasons of The Righteous Gemstones now on Foxtel.

The actor has lost 90kg in recent years. Picture: Valery Hache/AFP

In 2007, Goodman quit drinking to kickstart his wellness journey, and later hired a personal trainer to help him reach his goals.

He committed to a “Mediterranean-style eating plan”, which focuses on nutrient-rich whole foods and grains and has an emphasis on fresh produce and olive oil, and began exercising six days a week.

His fitness plan includes an elliptical bicycle and treadmill and a daily step count of 10,000-12,000 steps.

He’d previously tipped the scales at 178kg (pictured here in 2007).

He began a years-long fitness and diet overhaul to achieve his results.

Goodman has previously opened up about the ups and downs he’s experienced in his mission to live a healthier life.

“It takes a lot of creative energy to sit on your a**e and figure out what you’re going to eat next,” he told People magazine in 2010.

“I wanted to live life better.”

Goodman also spoke about his eating habits to US network ABC in 2016, admitting: “I’d have a handful of food and it’d go to my mouth. I was just eating all the time. I was just eating alcoholically.”

Goodman added that he would “take three months out” and lose 27-31kg, and then “reward” himself with a “6-pack of Bud or whatever” before returning to his “old habits”.

“Then this time I wanted to do it slowly, move, exercise. I’m getting to the age where I can’t afford to sit still anymore. And it gives me the energy to work, ‘cause work is very draining,” he explained.

“I just got tired, sick and tired of looking at myself. You’re shaving in the mirror and you don’t want to look at yourself. It gets dangerous.”

The Righteous Gemstones Season 3 is now streaming on Foxtel