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High-fat diet lets gut bacteria reach mouse brains — Level A1 — gray and black abstract painting

High-fat diet lets gut bacteria reach mouse brainsCEFR A1

17 Mar 2026

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Adapted from Emory University, Futurity • CC BY 4.0

Photo by Jean-Michel GARCIA, Unsplash

Level A1 – Beginner
2 min
75 words
  • Researchers at a university studied healthy and germ-free mice.
  • The mice ate a high-fat diet for several days.
  • The gut has many nerve cells and senses food.
  • Live gut bacteria moved from the gut to the brain.
  • Bacteria travelled along the vagus nerve to the brain.
  • Scientists found only a few bacteria in the brain.
  • Going back to a normal diet helped reduce bacteria.
  • The team says more study in humans is needed.

Difficult words

  • researcher — person who studies and tests in science
    Researchers
  • germ-free — without bacteria or tiny living things
  • high-fat diet — food with a lot of fat
  • vagus nerve — nerve that connects gut and brain
  • bacterium — very small living organisms found in body
    bacteria
  • nerve cell — cell that sends signals in the body
    nerve cells

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Have you ever seen a mouse?
  • Do you eat foods with a lot of fat?
  • Would you like to learn about the brain?

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