feline psychology - my two cats are turning their nose up at their food

[mattkime]

cats have opinions. i've been learning to navigate them and have had some success but there's a new wrinkle throwing me for a loop -

what initially started as a food boycott over food + fish oil has become a boycott of their regular food whether it has fish oil or not. i imagine they say to each other "i know it doesn't have the fish oil....but it makes me remember it, ya know?"

I've found tricks to get them interested in pill pockets they formerly boycotted but i'm coming up short when it comes to their regular meal.

any advice?