14/08/2014 12:38 BST | Updated 22/05/2015 06:12 BST

The McDonalds Diet: Meet The Teacher Who Ate Nothing But Fast Food For 90 Days &Amp; Lost 37lbs

A teacher in Iowa, USA, went on a McDonald's-only diet a la Morgan Spurlock's 2004 film Supersize Me - and guess what? He actually lost weight!

Well that's everything we ever believed about shedding the pounds out the drive-thru window.

But before you get to thinking this dude totally gorged on all the Big Mac, Apple Pies, Hash Browns and Chicken Legends with extra mayo, he didn't. He was far more clever and strategic about it.

Science teacher John Cisna, shockingly managed to consume the recommended 2,000 calories a day from carefully balanced food groups which all happened to be from Maccy D's. And even more surprisingly, he lost 37lbs!

After shifting the weight John came to a ridiculously profound yet totally logical conclusion: "It's our choices that make us fat. Not McDonald's," he told local television station KCCI.

Perhaps we should stop feeling guilty about those 20 chicken nuggets we deleted in the early hours of Saturday morning.