What you eat—especially fiber and complex carbs—mostly decides how much gut fermentation happens, and eating more of these carbs can boost fermentation by up to five times compared to a standard Western diet. The types of gut bacteria you have don’t really change the overall amount.

Evidence from Studies

Supporting (1)

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Quantifying the varying harvest of fermentation products from the human gut microbiota

Computational/Algorithm Study

In Vitro

2025 Sep 18

The study shows that what you eat—especially fiber and complex carbs—mostly决定了 how much gut fermentation happens, not which gut bacteria you have, which matches the claim.

Contradicting (0)

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No contradicting evidence found

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Source Study

Quantifying the varying harvest of fermentation products from the human gut microbiota

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DOI: 10.1016/j.cell.2025.07.005

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