You at least understand the different answers though. To be fair to people whose initial answer is “but I did eat breakfast” or something else, most people asking you in real life how you’d feel if you didn’t eat breakfast probably are asking if you did eat breakfast. The most frequent context of a question like that is someone asking you if you did eat breakfast or want to or something, not some out of context hypothetical, which is weird if you’re casually being asked that during another completely different conversation on something like Twitter.