Once again Jonah Hill has lost a load of weight, and now looks like a completely different person.
Since the 33-year-old hit new heights in the movie world, thanks to 2008's Superbad, it's been noticeable that his size often changes, generally dictated by the roles he's playing.
Pictured at the weekend, he was looking mightily slim - a contrast to when he piled on 40 pounds for last year's War Dogs. In turn, he'd previously lost that exact amount for Moneyball in 2011.
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Unfortunately, for all of you wondering whether or not there's a secret to his weight changes, there isn't. Just dieting and persistence, really.
"I wish there was some crazy thing that I did, like a pill or a genie or something. But, unfortunately, I went to see a nutritionist, and he told me what to eat to change my habits and stuff," he told ABC in 2012. "I found that Japanese food was very helpful to me. It was just mostly diet."
To put it back on for War Dogs, he, erm, ate more. Not really any mystery to that, is there?
Following putting the weight on, though, he knew he had to lose it again, so he enlisted the help of 21 Jump Street co-star Channing Tatum for motivation.
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"I called Channing Tatum and said, 'Hey, if I ate less and go to a trainer, will I get in better shape?'" Jonah said on The Tonight Show. "And he said, 'Yes, you dumb motherfucker, of course you will. It's the simplest thing in the entire world."
Credit: The Tonight Show
What Jonah is actually engaging in is something that's called 'yo-yo dieting'.
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The term was coined by Kelly D. Brownell at Yale University, and is something referred to as weight cycling. Put simply, it's when someone falls into a repetitive cycle of weight loss and gain.
It is a little different in that Jonah seems to have control over when he loses or puts on weight, whereas those who normally suffer from 'yo-yo-ing' are initially successful in losing the weight, but unsuccessful at maintaining it.
It begins because someone starts a diet that is so extreme that the loss in weight is fast. However, the nature of its extremities have an effect on overall well-being, both mental and physical, meaning that it's tough to carry on with it. This leads to the diet being sacked off, and thus the weight beginning to pile on again.
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"The truth is that yo-yo dieting isn't a permanent solution. It's usually restrictive, and eliminates many healthy items that contribute vitamins and minerals that your body needs in order to thrive and look its best," say Tone It Up founders Karena Dawn and Katrina Scott.
Ken Immer, CCHE and President & Chief Culinary Officer of Culinary Health Solutions, backs this up, saying: "When we eat unconsciously, which can go hand-in-hand with yo-yo dieting, we inevitably have some 'unintended consequences'.
"These include things like weight gain, or worse, diabetes and heart disease. When we are in control of our eating and make well-informed choices, we recognise the power of the foods that we are eating and we own the consequences. I don't believe there are 'good' and 'bad' foods; there are just the consequences of eating them.
He adds: "Bouncing back and forth is self-perpetuating because the extreme behavior that results in the 'quick results' tends to be like stretching a rubber band. The further you go, the stronger the stretch brings you back. When you gain weight back, it is often more than you lost, and there is the 'yo-yo'.
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"Develop a conscious eating plan that includes your favorite foods so that you stay happy. This can help your body maintain a healthy weight that will fluctuate a little bit over time, but the difference between 'weight fluctuation' and 'yo-yo' dieting is that you know you have achieved lifetime weight loss when you don't have the anxiety about gaining weight."
Doing this can allegedly lead to fatigue and even depression, as the body enters starvation mode, where biochemical and physiological changes start a change in metabolism because not enough food is being eaten.
Featured Image Credit: PATopics: Jonah Hill