"The Daniel Fast", as it's called, encourages its participants to come closer to God through a special diet and through petition and prayer.
"It's gonna coincide also coincidentally with the "Lego Movie 2" junkets, so by the time you see me, I'll probably be hallucinating", he added.
Chris Pratt has started an intense fast that will last him for three weeks.
The Jurassic World star is so jacked up on his new truck that he's offering to help other people move with it, so I guess if you're keen to try your luck, you can go ahead and slide into his DMs like he says. The name is inspired by the Old Testament prophet Daniel, who limited his diet to vegetables and water to be able to cleanse his body and better focus on a spiritual connection to God, leaving behind distracting indulgences like meat and wine.
Sounds like heaps of fun.
He recently took an opportunity to regale fans with his faith at the MTV Movie Awards.
Pratt rose to fame playing the noticeably more rotund Andy Dwyer in U.S. sitcom Parks and Recreation.
His weight yo-yo-ed over the following few years as he took on a number of different roles, including one as a buff squaddie in Zero Dark Thirty in 2012.
The Lego Movie 2: The Second Part is set to hit US theaters on February 8.