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Man who ate 100 percent ultra-processed food for 14 days reveals major impact it had on his mind and body

Home> Lifestyle> Food & Drink

Published 19:17 28 Apr 2025 GMT+1

Man who ate 100 percent ultra-processed food for 14 days reveals major impact it had on his mind and body

Gavin Wren ate ultra-processed food for two weeks and shared the results on YouTube

Joshua Nair

Joshua Nair

One content creator took it upon himself to eat only ultra-processed food for two weeks and share the results with viewers.

While more people than ever before have an eye on their diet and keep track of what goes into their body, the red flags around ultra-processed foods have become more prominent.

Ultra-processed foods can be defined as food that has gone through industrial processing, including ingredients that may not be used in regular cooking.

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Additives, preservatives or artificial ingredients may be included, as well as sweeteners.

Think packaged snacks, fizzy drinks, and processed meats.

However, Gavin Wren, a self-described 'food policy specialist', made himself a lab rat to see what would happen to his body, physically and mentally after two weeks of an ultra-processed food diet.

He took it upon himself to carry the experiment out (@‌GavinWren/YouTube)
He took it upon himself to carry the experiment out (@‌GavinWren/YouTube)

After eating pizzas, fast food such as McDonalds, and Red Bulls for four days, he admitted on the morning of day five that he felt 'rough'.

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Speaking to his YouTube audience, the normally healthy and active content creator admitted: "I feel really rough. I don't know why. I actually had a rest day yesterday from my exercise for my training. I ate around the right amount of calories as well.

"I've done my normal morning morning routine... so I don't know."

However, he showed that he was having some Alpine with oat milk, and as he couldn't have any water, he had to settle for some squash.

Gavin added: "These are all ultra-processed, I'm quite sensitive to like the food that I eat and I feel I'm just one of those people that's just sensitive to changes."

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While eating bread and for his mid-morning snack, he found that the sourdough bread he was eating had one gram of fat in each slice with added vegetable oil, very different to his homemade rye sourdough that he usually has.

Heading to the gym, he candidly stated: "I feel like s*** today, I've got no energy," explaining that he usually takes part in triathlon training and works out six times a week, but he had no energy after five days of the extreme diet.

By the end of day five, Gavin said he 'didn't really' do a workout and even said he was 'wobbly' in the gym.

He admitted that his reaction may have been 'over-the-top' and encouraged people to enjoy food while being conscious of what they were eating (@‌GavinWren/YouTube)
He admitted that his reaction may have been 'over-the-top' and encouraged people to enjoy food while being conscious of what they were eating (@‌GavinWren/YouTube)

"I feel a bit queasy to be honest. I just feel really unsettled in myself. My body is feeling almost fizzy, like it's lacking any energy," he pointed out, adding that he's been getting 'brain fog'.

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The content creator explained: "My body is struggling to process whatever it is that I need to do and the problem is with this, is that I don't get paid to make any of this content - I would really like to get paid for making it."

Admitting that the diet was 'f***ing up his day to day life', he decided to pause the challenge as he would end up feeling 'rubbish' with his 'energy levels in the gutter' by day five.

However, he did also point out that his diet and lifestyle might be different to the majority of others, and encouraged others to enjoy food, calling 'absolutism' an unhealthy eating behaviour.

Featured Image Credit: @‌GavinWren/YouTube

Topics: Health, YouTube, Food And Drink

Joshua Nair
Joshua Nair

Joshua Nair is a journalist at LADbible. Born in Malaysia and raised in Dubai, he has always been interested in writing about a range of subjects, from sports to trending pop culture news. After graduating from Oxford Brookes University with a BA in Media, Journalism and Publishing, he got a job freelance writing for SPORTbible while working in marketing before landing a full-time role at LADbible. Unfortunately, he's unhealthily obsessed with Manchester United, which takes its toll on his mental and physical health. Daily.

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@joshnair10

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