Fans may also remember him sporting a much fuller figure in 2007 hits like Superbad.
Pictured out this weekend, Jonah is almost unrecognisable having shed a serious amount of weight since gaining the pounds for his 2016 blockbuster movie War Dogs.
He was photographed leaving a Los Angeles gym on Friday afternoon wearing a navy blue tank top, black shorts, high socks and trainers and clutching a pink healthy shake.
Jonah Hill weight loss: Actor was spotted leaving the gym with bulging biceps
It was mostly diet. I wish there was some crazy thing that I did, like a pill or a genie or something, but I went to see a nutritionist, and he told me what to eat and to change my habits and stuff.
Jonah’s weight loss journey began in 2011 when he was filming Moneyball with Brad Pitt.
Rumours circulated Brad was the driving force behind his fitness overhaul, but Jonah later came out and said his weight loss was simply triggered by a new diet and looking after himself.
He told ABS News: “It was mostly diet. I wish there was some crazy thing that I did, like a pill or a genie or something, but I went to see a nutritionist, and he told me what to eat and to change my habits and stuff.
Jonah Hill weight loss: The star sported a much fuller figure in 2007