to Theprof1
I stand corrected 1) its not the Gemora 2) its not a “specific species”
See Taz & Magen Avraham siman 156 citing Bach citin Mordechai Gadol that there were environmental factors. The Taz “not following the Bach “lo hifsid” the Magen Avraham dimisses the Mordehai as based on a typo, so does thr Pri Megadim & Chacham Zvi teshuva 16. The P”M says it can be any of the 5 mininei dagan Pas Kisnin, but not cereal.
Seepiskei Yeshuvaquoting the PM as hot beverage perferable (I couldnt find it) and the Aishel Avraaham as saying that cereal is good (I couldnt find it)
Bottom line its “NUTRITIONAL ADVICE” the only mitzva “guarding health
Gut Yom Tov & a gut kvitel