...one day when Iris was around twenty months old we went to a Chinese restaurant that has live fish in tanks at the front of the restaurant ... We ordered a striped bass, and then I took Iris to look at the fish in the tanks. I explained to her that these fish swimming in the tanks were for people to eat, and that when we ordered our fish for dinner, a waiter came out and caught one of the fish in a net, took it back to the kitchen, and they killed it and were cooking it for us.
...I really did not know how Iris would respond to this. Some people have a very strong negative response when they first learn that meat comes from animals, so negative that they never eat meat again. But I thought Iris should know the truth and make her own decision about how to respond.
Iris's response was to point at one of the striped bass and say "I want to eat that one."
the full story here and a long discussion of the expected ramifications at reddit.