A food-policy expert who challenged himself to eat only ultra-processed foods for a month as part of an experiment gave up after just five days.

• Gavin Wren, a food-policy expert, challenges himself to eat a different diet every month.
• He tried eating only ultra-processed foods but gave up after five days.
• He said the diet made him feel sluggish and gave him a low mood.

Gavin Wren, a TikToker from the UK who shares insights about food policy, is on a quest to find the best diet for him; one that makes him feel good, allows him to socialize, and is good value for money. He has tried following popular diets, including veganism, the paleo diet, the Mediterranean diet, and only ultra-processed foods, for a whole month each.

He told Business Insider that the vegan and Mediterranean diets were his favorite but that the all-UPF diet was the worst.

Many people eat UPFs every day. A 2023 study published in The BMJ found that UPFs made up almost 60% of people's diets in the UK and the US. And a 2023 study published in Nature Communications found that 73% of the US food supply was ultra-processed.

While it's hard to avoid UPFs because they're so ubiquitous, experts advise people to cut down as much as possible. This is because UPFs are linked to health issues, such as type 2 diabetes, cardiovascular disease, cancers, and mental-health issues.

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