Brussels chicory might help stabilize atherosclerotic plaques in mice by reducing intestinal permeability and gut microbial LPS production. This study provides a promising approach to slow the progression of atherosclerosis.
The Journal of Nutrition, Volume 152, Issue 10, October 2022, Pages 2209–2217, https://doi.org/10.1093/jn/nxac103
Does not look like mice food.
Brussels chicory aka Belgian endive aka Witloof. We don’t eat much of this vegetable in the US. Maybe because virtually no one grows it.
Demand has grown such that California Endive Farms, who are the only commercial endive producer in the country, has had to expand their operations in order to keep up.
Belgian endive consumption in the US on the rise — https://www.infiniteherbs.com/belgian-endive-consumption-in-the-us-on-the-rise/
lifeunderwriter.net 
My Mother served endive. Also bok choy, escarole, and kale. Nobody else I knew ate these vegetables.
Bok choy as a kid for obvious reasons!
Bok choy was extremely common in Irish households. Also escarole. I found it very bitter. But you ate what my mother served.