a whole gigantomungous building crammed with foods of all sorts... how come i don't know what to buy?

i stand there. i get very anxious. i can't understand what to get. My mind goes blank. i tried taking a list but when i pick the foods up in my hand my stomach rolls over and i have to put them back. Eventually i get so anxious i come home with a bunch of random things. Ranch dressing, tuna and a bag of grapes?

*sigh