It's been a while since I read The Paleo Diet but from what I recall I think he said you can eat them but try to limit the amount as well as try to get the omega-3 enriched type.
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."