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You'd be forgiven for thinking that if you ate nothing but food from McDonald's for an entire week you'd put on a few pounds, however, one YouTuber who set himself the challenge actually lost weight.
Mike Jeavons said he was inspired by the documentary Super Size Me and decided to take on a similar challenge himself, but with a twist.
Thirty-three-year-old Mike wanted to see if it was possible to maintain a balanced diet, sticking to the recommended guidelines for calories, salt and fat, while eating nothing but food from McDonald's.
Mike said: "I thought the documentary was a little sensationalised. If you're eating about 5,000 calories a day, then of course you're going to put on weight and find your well-being affected.
"But I wanted to stick to the daily recommended amounts of things like calories, fat and salt, to see if I could have a balanced diet eating at just one outlet and still end up happy and full at the end of it all."
Initially, Mike's wife Grace joined in with the challenge, but after a few days decided to pack it in and go back to eating home-cooked food. Mike persevered on his own.
He says breakfast was easy enough, switching between bagels, porridge and muffins. He would then choose a light meal for lunch and this was where he would begin to struggle.
"I knew I'd be having a big burger for dinner, so I wanted to stick to something like a salad or wrap," he said. "But I'd get these major energy slumps afterwards.
"Then, by the time I had dinner, I'd feel almost euphoric afterwards. It was like a drug.
"I had a strange relationship with food that week. It was an odd mix of really not wanting to eat more of the same, but also looking forward to my next burger."
By day three, he said he began to experience stomach problems, which he thinks was down to all the fat he was eating coupled with the amount of sugar-free drinks he was knocking back.
He said: "To keep everything in line with the recommended daily allowances, I had to save calories where I could.
"Because I was eating so much fat, zero-calorie drinks were a saviour - though they did make me feel ill after a while.
"By the end, I felt pretty sluggish and would get major slumps."
By the end of the week he was seriously craving a home-cooked meal - but made sure he ended the challenge with his largest meal of the week, a quarter pounder with cheese.
Weighing himself at the end of the week, he was astonished to find he had shed 5lb (2.2kg) going from 15st7lb (99kg)to 15st2lb (96kg).
You can check out this challenge and Mike's previous week-long food challenges on his YouTube channel here.
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