if you're not replenishing enough meat protein-based fats from meat your body is not be able to replenish brain tissue as well without basic chemical materials it has evolved to use to replenish that tissue
morality and ethics aside that's a biological fact
that fact doesn't void or absolve any of the moral issues with industrialized mass murder of cows, pigs and chickens but it is a fact
your brain is mostly fat
if you're not replenishing enough meat protein-based fats from meat your body is not be able to replenish brain tissue as well without basic chemical materials it has evolved to use to replenish that tissue
morality and ethics aside that's a biological fact
that fact doesn't void or absolve any of the moral issues with industrialized mass murder of cows, pigs and chickens but it is a fact