What kind of "keratin" substance is contained in lentils and beans (I can't remember the scientific name), which is toxic; There are quite a few cases of collective food poisoning caused by undercooked beans and lentils. Considering the processing conditions of the canteen, it is too common to get a medium-cooked one, so it is simply forbidden.

Pig liver should be due to hormonal problems. In order to speed up the slaughter of pigs, pig farms add hormones, and the concentration of non-metabolizable hormones in the liver is very high. Once, China athletes were suspected of taking stimulants after a urine test, and after investigation, they ate pig liver containing hormones ... What about the students in sports colleges?