The Study
Influence of Nonenzymatic Browning Reactions on the Digestibility and Gut Microbiota Fermentation of Starch and Protein
This article is like a summary of many different science experiments done by other people, but it didn't do any new experiments itself. It says 'some studies found this' and 'other studies found that,' but it can't prove that cooking food actually causes health changes in people.
Analysis score
Maximum 5 for a narrative review.
Where the score came from
When food gets browned or burnt during cooking, chemical reactions create compounds that make starch and protein harder to digest and also feed different gut bacteria.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 51 / 100
Quality score
Systematic reviews and meta-analyses of cohort studies. They sit above a single cohort study but below a single randomized trial, because the underlying evidence is still observational.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes—this means cooking methods like grilling or roasting might improve some gut functions but could also promote inflammation, depending on what bacteria grow.
- 2Browned food reduces starch digestion by up to 40% in lab tests; it increases good bacteria like Ruminococcaceae (which make butyrate) but also bad bacteria like Desulfovibrio (linked to gut inflammation).
- 3Some burnt-food compounds are fully broken down by gut bacteria into usable nutrients.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Comprehensive Reviews in Food Science and Food Safety
Year
2025
Authors
Wensheng Ding, Yichen Bai, Devin J. Rose
Related Content
Claims (6)
Eating carbohydrates causes blood sugar to rise quickly, and this elevated sugar binds to proteins in cells, creating harmful chemical changes.
Maillard reaction products increase certain gut bacteria that produce butyrate and increase other bacteria linked to gut inflammation and damage to the intestinal lining.
Cooking food at high temperatures produces chemical compounds that slow down the breakdown of starch in the digestive system, leading to lower rates of glucose release after eating.
Heating food causes chemical changes in proteins that make them harder to break down during digestion, reducing the amount of amino acids the body can absorb.
Certain compounds formed during cooking, such as N-ε-fructosyllysine, are completely broken down by specific gut bacteria into lysine and lactic acid, meaning these food-derived chemicals are used as fuel by microbes in the human intestine.
Cooking food at high temperatures that cause browning increases levels of certain chemical compounds called AGEs, which are associated with lower diversity of gut bacteria and reduced levels of specific bacteria that produce butyrate in animals.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.