Drink Sea water
Out of intrest do you think humans would have developed with out eating fish, meat or eggs?
I.e the proto humans (in monkey form) took a risk and from it developed the human.
Im sure the monkey and apes who said (well communicated in some form) dont do it at the time thouht that meat would kill them all.
Thats not to say vegan way of life is a bad idea nowdays. But shows how not thinking outside of the box at certain points in time....