Onions

Quercetin, sulphur compounds, alcohol propyl ,disulphide and prebiotic compounds are all polyphenols compounds that are abundant in onions which give gut health a boost.

Conclusion

Your  gut bacteria is extremely important for many aspects of health the best way to maintain a healthy microbiome is to eat a range of phrase whole foods mainly form plate source like fruits veggies, legumes beans and whole grains.