Colt Prattes decided to follow an unconventional diet to prep for his role in the Dirty Dancing remake — one inspired by Matthew McConaughey‘s extreme weight loss plan to play an AIDS patient in Dallas Buyer’s Club.
Prattes — whose abs and love of weight lifting are well-documented on his Instagram — says he had to slim down to fit the look of the era.
“I actually had to lose about 20 to 30 lbs. for the movie because nobody was that big in the ’60s,” he told E! at the movie’s PaleyLive premiere. “I went on Matthew McConaughey’s Dallas Buyer’s Club diet as quick as I could.”
“He said it’s like, 8 oz. of fish in the morning, 8 oz. of fish at night, and all the red wine you can drink,” Prattes says.
McConaughey explained his actual program on The Ellen DeGeneres Show in 2013.
“I met with two nutritionists first, so I found out how I could lose 2 to 3 lbs. a week,” he told DeGeneres. And I had eight meals, but I had small meals. 5 oz. of fish, a couple of vegetables, a little something else three times a day and I also had my red wine at night to keep my head straight.”
FROM PEN: Half Their Size: The Weight Loss Stars Get Total Makeovers
While Twitter users largely slammed the Dirty Dancing remake online, they were fans of Prattes — and his body.
Prattes told PEOPLE that he was thrilled — but nervous — to step into Swayze’s shoes for the iconic role.
“I couldn’t try to be Patrick Swayze, he’s Patrick Swayze. The man’s a legend. I just wanted to love it and dance as hard as I could,” Pratte said.