Keep in mind, there are more people who have a medical necessity to avoid cruciferous vegetables (like cabbage), gluten, nuts, and other types of plants than there are people who have a medical necessity to avoid meat.
As a whole, more humans are medically biologically incompatible with plant consumption than animal consumption.
Note that I'm talking about adverse medical reactions that range from worsening of chronic disease to acute death, not merely gastric discomfort, like with lactose intolerance.
Not everyone has the privilege of enjoying buttered cabbage.
