Gut Health Link to Heart Disease: New Research Reveals Surprising Connections
Gut bacteria imbalances may contribute to artery disease, says new review.
Top Summary
- What happened: A narrative review suggests that gut microbiome disruptions are linked to the development of atherosclerosis and peripheral artery disease (PAD).
- Why it matters: Understanding this connection could lead to new strategies for preventing and treating vascular disease by targeting the gut microbiome.
- What changes for people: This may eventually lead to dietary or probiotic interventions to improve gut health and reduce vascular disease risk, pending further research.
- Who is affected: Individuals at risk of or diagnosed with atherosclerosis or peripheral artery disease, including those with diet, diabetes, hypertension, smoking, and obesity.
Gut Microbiome's Impact on Artery Health
Changes in the gut microbiome may influence artery health, inflammation, and the risk of peripheral artery disease (PAD). Gut dysbiosis, or an imbalance in the gut microbial environment, could be a driver of vascular damage.
The review highlights that gut bacteria plays a meaningful role in the development of atherosclerosis and PAD.
The Role of Gut Bacteria
In people with vascular disease, researchers observed higher levels of bacteria linked to pro-inflammatory and pro-atherogenic activity. These include Enterobacteriaceae, Streptococcus spp., Lachnoclostridium, and Family XI.
Conversely, beneficial bacteria that produce short-chain fatty acids (SCFAs) appeared to be reduced. Examples of beneficial bacteria include Roseburia, Faecalibacterium, Coprococcus, and Ruminococcaceae.
Key Gut-Derived Metabolites
The discussion centers on two key groups of gut-derived metabolites: trimethylamine N-oxide (TMAO) and short-chain fatty acids (SCFAs).
Higher TMAO levels are linked to endothelial dysfunction, inflammation, platelet reactivity, and greater vascular risk. SCFAs, including acetate, propionate, and butyrate, are potentially protective, with anti-inflammatory effects and links to better insulin sensitivity and improved endothelial function.
PAD and the Gut Microbiome
Certain bacterial groups, including Coprococcus 2 and Ruminococcaceae subtypes, were associated with lower PAD risk. Lachnoclostridium and Family XI were associated with greater risk.
The mechanisms include reduced SCFA production, increased inflammatory signaling, impaired nitric oxide activity, and higher TMAO levels.
Modifying the Microbiome: Potential Strategies
Potential strategies to support a healthier gut microbiome include probiotics, prebiotics, the Mediterranean diet, and fecal microbiota transplantation.
Among probiotics, Lactobacillus rhamnosus GG was highlighted for its possible role in lowering TMAO. The Mediterranean diet supports SCFA-producing bacteria while limiting red meat, a source of TMAO precursors.
These interventions remain investigational in this setting, requiring longer-term clinical trials.
What to Watch Next
Future research will focus on longer-term clinical trials to validate microbiome-targeted approaches. These trials are needed before such approaches can be considered established tools in vascular prevention or treatment.