The Impact of a Vegan Diet on Cardiovascular Disease Risk in Men and Women Through the Gut Microbiome

Abstract

Studies highlight many benefits of a vegan diet on the composition of the gut microbiome, however little is known how and if these changes contribute to heart health. Trimethylamine (TMA) is a metabolic product produced from the breakdown of choline and L-Carnitine both found abundantly in red meat. TMA is converted to toxic trimethylamine N-oxide (TMAO) in the liver via flavin monooxygense 3 (FMO3). The objective of this study was to examine if vegan diets impact TMA levels thus supporting cardiovascular health. We hypothesize that a vegan diet will foster bacterial diversity that favors decreased TMA/TMAO levels. Zebrafish were initially placed on antibiotics to clear their microbiome, following treatment, fish were fed a control, high fat (HF), or vegan diet for 3 weeks. Fish were sacrificed and intestinal, liver and heart tissue were harvested for analysis. Surprisingly, we observed the most significant increase in bacterial abundance in the HF diets relative to the vegan and control diets (n= 5-6, p< 0.05). Interestingly, when separated by sex, the highest change in bacterial abundance was seen in female fish on a HF diet. We next examined mRNA levels of FMO3. We saw the greatest increase in FMO3 levels in female fish on a HF diet, which corresponds to higher bacterial abundance (n= 5-6, p< 0.05). FMO3 levels were also increased for fish on a HF diet relative to the control diet with no significant differences between male and female fish. These results indicate that vegan diets may alter male and female bacterial composition differently and the impacts of these differences on CV health remain unknown. Funding thus far has come from Elon University. This is the full abstract presented at the American Physiology Summit 2023 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.