Your gut bacteria don’t change how much waste they produce overall, but they do change what kinds of waste chemicals—like butyrate and lactate—are made, and this mix is different for everyone depending on their unique gut bug lineup.

Evidence from Studies

Supporting (1)

0

Community contributions welcome

0

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

Computational/Algorithm Study

In Vitro

2025 Sep 18

The study shows that while everyone's gut bacteria make about the same total amount of fermentation products, the kinds of products—like butyrate or lactate—depend a lot on which bacteria are present.

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

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

0

DOI: 10.1016/j.cell.2025.07.005

Similar Assertions

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.

0

83%

The gut bacteria in people eating lots of fiber can provide up to 12% of their daily energy, while those on a typical Western diet get only 2%–5% from their gut bugs — so what you eat changes how much energy you get from your microbiome.

0

79%

What you eat overall—like veggies, meat, or carbs—is probably what’s really changing your gut bacteria, not the sugar-free sweeteners in your diet.

1

0

75%