Dr Elan Elinav and Prof Elan Segal of Israel’s Weizmann Institute have made many medical discoveries from microbiome (gut bacteria) research. They include artificial sweeteners’ link to obesity / diabetes and gut microbes’ impact on ALS. There are 40 scientists in their research lab.
https://www.israel21c.org/is-the-microbiome-about-to-change-medicine-for-good/