Growing up, I didn't like anything with mushrooms. In fact, every time I had to eat it (Parents :P ), it actually tasted really bad to me. Having trouble swallowing it down and keeping it in.
Now I love mushrooms. They are tasty and delicious!
I doubt it were the mushrooms that changed!
--- The same can be said for everything with aquired taste. A simple example, if you always drink one brand coke, you'll find that brand to be the most delicious. If you change brands, at first you will find the taste bad. But as you keep drinking the other brand, you will start to enjoy that brand more, and the other brand will not be as tasty.
Surely that is a clear sign of mental mallebility.