The research found nitrate-rich vegetables, such as lettuce, spinach, kale and even beetroot, provided the greatest health benefits.

https://academic.oup.com/jn/advance-article-abstract/doi/10.1093/jn/nxaa415/6184158?redirectedFrom=fulltext short article

https://www.bbc.com/future/article/20190311-what-are-nitrates-in-food-side-effects long article

https://medicalxpress.com/news/2018-12-green-leafy-vegetables-liver-steatosis.html PREVENTING FATTY LIVER