And to continue on the feline aspect of this thread, the only live person I have known who is more selective with respect to food is my (soon to be ex) 2nd husband. His preferences are similar to mine, he also cannot eat salty or spicy food or foods altered by condiments etc., but he also needs all foods served at the same time and positioned in a particular order on the dinner table. Everything needed to be available at the same time on the dinner table. Bread only toasted and only two kinds - either one particular kind of San Francisco sour dough or pure German rye bread. No other breads. Feta cheese only from one particular country (I forgot which one since I have not fed him for half a year) out of the whole range of feta-producing countries. (I am not so discriminating and can eat feta from different countries as long as it is made from sheep's milk or goat's milk or a combination of the two but not from cow's milk). And avocados needed to be cut and served separately and never added to salads, or, god forbid, made into guacamole. And the list went on. And, of course, variety and rotation.

AND, such a person buys one and the same substandard and horrible cheap cat food for his precious kitty and does not offer the kitty ANYTHING else all year round.

So what about

"The Golden Rule or ethic of reciprocity is a maxim

...

(Negative form of Golden Rule): One should not treat others in ways that one would not like to be treated." (from Wikipedia)

or are cats exempt?