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Do fermented foods cause stomach cancer?

Tim Spector · 18 Oct 2026

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Every claim below was made in this piece, quoted word for word and numbered in the order the piece makes them, so you can read it there rather than take our word for it. The sentence above each quote is our reading of the claim, not their wording. Each quote was checked against a stored copy of the page at build time; where the two differ, the quote is the fact.

  1. What these foods have in common isn’t fermentation – it’s salt.
  2. In other words, what really moved the needle was less salt-preserved food and fewer H. pylori infections – not giving up fermented foods.
  3. The viral claim is a red herring. There’s no good evidence that fermentation itself causes cancer.
  4. So I still recommend three portions of fermented foods a day – it’s what I do.

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