A German study found five days of extra ultra-processed snacks changed how the brain responds to insulin.
Key Facts
- Study: Nature Metabolism, 2025
- Who: 29 healthy young men
- 18 ate 1,500 extra calories a day for five days
- 11 kept their normal diet
- Liver fat went up
What They Found
Brain changes were still seen a week after the men went back to normal eating. They did not gain weight.
Expert Advice
Dietitian Jemma O’Hanlon said: “It’s important to cut back on ultra-processed foods.”
Simple Tips
- Choose fruit, veg and whole foods
- Keep treats small and occasional
- Drink water
Frequently Asked Questions
How long did the study last?
Five days of extra snacks.
Who took part?
29 healthy young men.
What changed?
How the brain responds to insulin, and liver fat.
Conclusion
Even short bursts of junk food may affect the brain.
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