A moral objection to animal suffering is sufficent I think.
As for DNA, every living thing needs a type of replicator to survive, be it DNA, RNA or something we don't know about.
Okies, read up to this and thought for a moment...
Okay, I'll give it to you in some places on earth for food, animals are made to suffer. A little. But mostly, and probably ALWAYS in Yliakum unless the butcher was cruel, the animals would be dead before they knew anything hit them. Vegetarians generally either are vegetarian for the dislike of the taste of meat, dislike of the killing of animals, or because they are dieting. Vegans are usually because of the moral standpoint. They just don't eat any animal products, and there is variety on how careful they are. on EARTH, no matter what, face it you're gonna use animal parts. Otherwise you're gonna stink, starve, etc. I respect their opinions, of course. I just dislike the ones that are yelling at me for eating it. Which are rare, but I've actually met quite a few of them and I have SOOO wanted to tell them that their animal product made soap smells so good

Anyways. PS, I can see it to the minor vegetarian level for the taste concept, but the moral idea and dieting are probably out the window. Moral because it isn't cruelty to butcher an animal the way it should be (heck think of the poor animals killed by other animals that die slowly when we do it quick and knock their heads of with an axe, or on earth kill them instantly with a spike through the neck). Dieting... Heck, that is generally solved because people actually have to work for a living instead of sit around all day doing nothing, or doing something but still sitting all day.Most people are warriors, miners, blacksmiths, etc, and all give a fair amount of a workout, which gets rid of the need for dieting for the most part. As for protein alternatives, I don't see that being very prevalent in PS just because it doesn't seem worth it. If you think about it, in medieval timeframes they didn't really worry about it. Food is food, if it keeps you alive, you eat it. As an off note, people would need the fats from the meats for their energy

Kran.... Are a different story all together.