Causal relationships among the gut microbiome, short-chain fatty acids and metabolic diseases
Open accessAbstract
Microbiome-wide association studies on large population cohorts have highlighted associations between the gut microbiome and complex traits, including type 2 diabetes (T2D) and obesity1. However, the causal relationships remain largely unresolved. We leveraged information from 952 normoglycemic individuals for whom genome-wide genotyping, gut metagenomic sequence and fecal short-chain fatty acid (SCFA) levels were available2, then combined this information with genome-wide-association summary statistics for 17 metabolic and anthropometric traits. Using bidirectional Mendelian randomization (MR) analyses to assess causality3, we found that the host-genetic-driven increase in gut production of the SCFA butyrate was associated with improved insulin response after an oral glucose-tolerance test (P = 9.8 × 10−5), whereas abnormalities in the production or absorption of another SCFA, propionate, were causally related to an increased risk of T2D (P = 0.004). These data provide evidence of a causal effect of the gut microbiome on metabolic traits and support the use of MR as a means to elucidate causal relationships from microbiome-wide association findings. Mendelian randomization analyses using genotyping data, gut metagenomic sequence and fecal short-chain-fatty-acid levels from 952 individuals combined with GWAS data show evidence of a causal effect of the gut microbiome on metabolic traits.
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Prebiotics have the potential to improve glycemic control through gut microbiome modulation.
“Prebiotics have the potential to improve glycemic control through gut microbiome modulation, though this mechanism was not directly assessed in the present study.”
From Prebiotic soda lowers postprandial glucose compared to traditional soda pop: a randomized controlled trial (2025) · cites this paper as [24]
The paper’s discussion of prebiotics (section labeled Abstract; no page given) reports that fructo-oligosaccharides reduced butyrate-producing bacteria and had an adverse effect on glucose metabolism after an oral glucose tolerance test. Although the paper links other microbiome changes to improved insulin response, its specific prebiotic example points in the opposite direction from the attributed claim. (LLM, conf=0.86)
Checked by a reasoning model — may be wrong.
Experimental — accuracy not yet measuredIncreased intake of dietary fiber reduces the risk for developing metabolic diseases, possibly by changing gut microbiome composition and diversity with increased production of SCFAs.
“Further, epidemiological and experimental studies have demonstrated that increased intake of dietary fiber reduces the risk for developing metabolic diseases (188–190), possibly by changing gut microbiome composition and diversity with increased production of SCFAs (187–189).”
From The Role of Short-Chain Fatty Acids From Gut Microbiota in Gut-Brain Communication (2020) · cites this paper as [187]
The paper’s Abstract says gut bacteria produce SCFAs by fermenting undigested food and reports that a shift toward butyrate-producing bacteria benefits insulin response. This supports a possible microbiome–SCFA mechanism, but the paper does not establish that increased dietary fiber changes microbiome diversity or reduces the risk of developing metabolic disease; it reports no detectable effect on type 2 diabetes risk for the butyrate-producing shift. The indexed passages provide no page numbers. (LLM, conf=0.84)
Experimental — accuracy not yet measuredA shift in the microbiome composition away from species able to produce butyrate was one consistent finding in type 2 diabetes subjects.
“Despite differences in the identification of specific microbiome features responsible for these effects, a shift in the microbiome composition away from species able to produce butyrate was one consistent finding in type 2 diabetes subjects (187).”
From The Role of Short-Chain Fatty Acids From Gut Microbiota in Gut-Brain Communication (2020) · cites this paper as [187]
A recent combination analysis using GWAS of the microbiome and metagenomic sequencing discovered a causal effect of the gut microbiome on metabolic traits, suggesting increased gut butyrate production is associated with improved insulin response after an oral glucose-tolerance test, while errors in production or absorption of propionate are causally related to enhanced risk of type II diabetes.
“The most recent combination analysis using GWAS of the microbiome and metagenomic sequencing has discovered a causal effect of the gut microbiome on metabolic traits, suggesting increased gut butyrate production associated with improved insulin response after an oral glucose-tolerance test, but errors in production or absorption of propionate causally related to enhanced risk of type II diabetes (”
From The Microbiota-Gut-Brain Axis (2019) · cites this paper as Sanna et al., 2019
Intestinal microbe composition and corresponding byproducts [e.g., short-chain fatty acids, (SCFA)] are associated with diabetes risk in clinical observations and have been shown to improve glycemic control in pre-clinical models.
“Intestinal microbe composition and corresponding byproducts [e.g., short-chain fatty acids, (SCFA)] are associated with diabetes risk in clinical observations (24) and have been shown to improve glycemic control in pre-clinical models (25).”
From Prebiotic soda lowers postprandial glucose compared to traditional soda pop: a randomized controlled trial (2025) · cites this paper as [24]
Bacteria that produce short-chain fatty acids are important regulators of metabolic homeostasis.
“Bacteria that produce short-chain fatty acids (SCFAs) are important regulators of metabolic homeostasis.87, 88”
From Influence of the Gut Microbiome, Diet, and Environment on Risk of Colorectal Cancer (2020) · cites this paper as [87]
A bidirectional Mendelian randomization analysis provided genetic evidence that increased intestinal short-chain fatty acid production improves insulin responses and reduces abnormalities in short-chain fatty acid production or absorption and risk of type 2 diabetes.
“A bidirectional Mendelian randomization analysis provided genetic evidence that increased intestinal production of SCFAs improves patient responses to insulin and reduces abnormalities in the production or absorption of SCFAs and risk of type 2 diabetes.87”
From Influence of the Gut Microbiome, Diet, and Environment on Risk of Colorectal Cancer (2020) · cites this paper as [87]
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“Despite differences in the identification of specific microbiome features responsible for these effects, a shift in the microbiome composition away from species able to produce butyrate was one consistent finding in type 2 diabetes subjects (187).”
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- Authors
- Sanna, S., van Zuydam, N. R., Mahajan, A., Kurilshikov, A., Vich Vila, A., Võsa, U., Mujagic, Z., Masclee, A. A. M., Jonkers, D. M. A. E., Oosting, M., Joosten, L. A. B., Netea, M. G., Franke, L., Zhernakova, A., Fu, J., Wijmenga, C., & McCarthy, M. I.
- Affiliations
- University Medical Center Groningen (NL)
- Centre for Human Genetics (GB)
- Maastricht University Medical Centre (NL)
- Radboud University Medical Center (NL)
- Corresponding author
- Sanna, Serena
- Wijmenga, Cisca
- McCarthy, Mark I.
- ORCID
- Venue
- Nature Genetics
- Published
- 2019-02-18
- Volume
- 51
- Issue
- 4
- Pages
- 600-605
- ISSN
- 1061-4036 (ISSN-L)
- 1546-1718
- PMC
- PMC6441384
- OpenAlex
- W2913914265
- Semantic Scholar
- 1c6ce10bc7c9676f9506eaa8f595a029ac38be90
- Cited by
- 1,539
- References
- 56
- Citations by year
- 2026: 160 · 2025: 236 · 2024: 335 · 2023: 258 · 2022: 172 · 2021: 183 · 2020: 140 · 2019: 53
- FWCI
- 45.60
- Type
- journal article
- Language
- en
- Open access
- green
- research.rug.nl
- Licence
- other-oa
- www.springer.com/tdm (tdm)
- Locations
- Nature Genetics (publishedVersion)
- PubMed (publishedVersion)
- University of Groningen research database (University of Groningen / Centre for Information Technology) (publishedVersion, other-oa)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Research Publications (Maastricht University) (submittedVersion, other-oa)
- Radboud Repository (Radboud University) (submittedVersion)
- University of Groningen research database (University of Groningen / Centre for Information Technology) (submittedVersion, other-oa)
- Research Publications (Maastricht University) (submittedVersion)
- Funders
- Wellcome Trust (106130/Z/14/Z)
- National Institute for Health and Care Research (FP7/2007–2013, NF-SI-0611-10099, NF-SI-0617-10090)
- Rijksuniversiteit Groningen (CVON2012-03)
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (FP7 2007-2013, # 016.176.006, 864.13.013, SPI 94- 212, 016.Vidi.178.056, SPI 92-266)
- Novo Nordisk
- Universitair Medisch Centrum Groningen
- Novo Nordisk Fonden (NNF15CC0018486)
- National Institute of Diabetes and Digestive and Kidney Diseases (U01DK105535)
- H2020 European Research Council (715772)
- FP7 Ideas: European Research Council (310372, 322698)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Nutrition, Genetics, and Disease
- Keywords
- gut microbiota, short-chain fatty acids, butyrate, propionate, type 2 diabetes, obesity, insulin response, glucose tolerance, metabolic phenotypes, causal inference, bidirectional Mendelian randomization, host genetics, gut metagenomics
- MeSH terms
- Gastrointestinal Microbiome, Adolescent, Adult, Aged, Aged, 80 and over, Diabetes Mellitus, Type 2, Fatty Acids, Volatile, Female, Genotype, Glucose Tolerance Test, Humans, Male, Metabolic Diseases, Middle Aged, Netherlands, Young Adult
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