Back in 2010, Corey Harrison, one of the stars of the History Channel's "Pawn Stars," was facing a health emergency due to a dangerous weight of 402 pounds. At only 31 years old, his doctor was already recommending preventative diabetes medication.

"I literally drove straight from the doctor to the lap band center and had the surgery almost immediately," Harrison told People magazine. "Back then, the surgery was too expensive for my bank account, so I had to pay with four credit cards, but it was something I had to do — I was not going to get diabetes!"

Lap band surgery (known formally as Laparoscopic adjustable gastric banding) is a surgical procedure that limits the amount of food the stomach can hold. This helps patients eat less and feel full more quickly. 

Harrison says in the weeks after the surgery that he immediately dropped 50 pounds, with an additional weight loss of 100 pounds a year later. He now weighs 210 pounds and, thanks to a refreshed lifestyle, plans to keep losing weight and staying healthy. 

"I'm actually excited to go to the gym now. I box 12 rounds a day five days a week," he says. "When I was a teenager I loved snowboarding, but in my 20s I was too big to strap my feet in the boards. Being able to finally touch my toes made me realize I could snowboard again, so I went out and got new gear immediately." 

In celebration of his new healthy outlook, Harrison recently posted a photo comparing the difference between his frame before and after. 

"I could never go back to weighing as much as I did," he added to People. "It made me realize what I ate, how I ate and what I did to myself."

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Michael d'Estries ( @michaeldestries ) covers science, technology, art, and the beautiful, unusual corners of our incredible world.

How Corey Harrison of 'Pawn Stars' lost 192 pounds
Reality television star says he took drastic measures to avoid diabetes.