As stated above. I can go months without eating an egg, for example, and suddenly crave eggs benedict for breakfast everyday.
Good thing is my dietitian is aware of this executive dysfunction/quirk/habit and works closely with me to help me out planning meals in a way that works me.
Right now I am on a soup kick: Soup, soup, soup everyday, all day.
ETA A word
In a similar vain, I’ve heard that if you’re hungry but can’t decide what to eat you’re actually thirsty.
Can be, yeah.
Tangentially related fact: dolphins never drink in the wild (what with the salt in the water), but get all their water from what they eat. When they’re given fresh water though, they will drink it, but this will “confuse” their metabolism and they won’t eat for days.