Definitely that applies to chicken and fish -- both of which so far from us sentient mammals that I have no problem killing and eating them (and our family raised chickens which I helped to kill and eat (stupid birds!).
I also dearly do love pork, lamb and beef in their place with mashed potatoes. I rationalize that the cows, sheep and pigs we eat have been bred to be more stupid than their wild ancestors. Deer, elk and bear are a step up in sentience, intelligence, and maybe consciousness, but I have little problem with killing and eating them.
Whales or dolphins I would have more of a problem with killing and eating because they are closer to us on the sentience, sapience, consciousness, intelligence, self-awareness scale.
I guess that some desensitization is needed in order to kill and eat some of our more intelligent fellow mammals. Probably that desensitization is similar to that needed to kill some of our fellow humans in self-defense or in war. Some of our enemies I'd rate lower than whales or chimps.
The baleen whale’s role in life is engulfing huge amounts of organisms like krill and swallowing them alive. The toothed whales snap and swallow live fish or, in the case of teh sperm whales, live squid.
Unless one is a plant, one lives by killing and thus harvesting the collected energy of ones prey.
Once one accepts the basics of biology, one avoids the endless second guessing of what should I eat.
In my case, I know that a whole apple pie and an endless supply of perfect peaches does have a lingering effect on me.
That effect is called “fat”, so on that note I shall sally forth into the ‘Glades and do some work.
Have a good week,
GG