Ridiculous comment. The human body is not designed at all, and is very much capable of surviving without milk and meat. It's not even very hard!
Hardest part is knowing implicit animal ingredients you might not otherwise guess, which almost tripped me up when I visited the US and (as a vegetarian*) almost bought some yogurt before reading the ingredients list and finding to my surprise that it contained gelatine.
* it's mainly the cheese; I've substituted out other uses of milk. Also, vegan yogurt is a thing now, not sure when that happened, before or after that visit.