Snap

There comes a time when things just change. It's not something traceable, not something clear, not something controllable at all. Without warrant: feelings, thoughts, and emotions just *snap* from what they were to the polar opposite. Whether it's realizing you all of a sudden can't stand liverwurst, that you have a insatiable taste for cottage cheese, or even that you actually detest someone you used to even...love.
These changes go unnoticed in humans, and are therefore unconscious changes that don't affect one's life at all. However, if the individual experiencing said changes is so in tune with the changes that they do in fact recognize them, there can be some odd consequences. Knowing you are changing and there is not a motion you can partake in to stop it can/must be an disconcerting and alarming occurrence.
That's all a part of life. If we all stayed the same person we were at age six, how immature and dull the human race would end up being.