The 21 Jump Street star appears to have lost all of the weight he purposely packed on for his 2016 movie War Dogs as he took a stroll in LA looking slim and fit in an all-black ensemble
In an interview with Jimmy Fallon last year, Jonah revealed he had turned to co-star Channing Tatum for advice on getting into shape.
'I called Channing Tatum and said, "Hey, if I ate less and go to a trainer, will I get in better shape?" And he said, "Yes, you dumb motherf***er, of course you will, it’s the simplest thing in the entire world."'
Jonah’s weight has famously yo-yoed over the years, so hopefully this time his new, healthy approach to life is here to stay!