I got interested in many things post-puberty, and lost interest in others.
Up until I was about 14 I was obsessed with reptiles. I was well versed in their care and had quite a collection of lizards, snakes, turtles, etc. Around the time I was 14 I just lost interest. It worked out for the best because my mom and I had been forced to move in with my grandparents at the time and my grandmother was very vocal about not wanting my reptiles in her home. Particularly snakes. My grandfather, also, did not approve. Every time I fed my snake in their home he told me he didn't like feeling like an accessory to the murder of the poor mouse in question... even though I bought them frozen. I tried to reason with him asking how he felt about the murder of the fish he'd had for dinner, or of the cow he had the day before, but he didn't see it that way, so I got rid of my reptiles. Found new homes for them. It was okay though because my interest had been dwindelling.
Also around 12-14, I became interested in the opposite sex, and had a period where I questioned my sexuality quite intensely. Was I gay? Was I not? I didn't know for about 5 years.
Anyways, around that time I became interested in many other things. Cars, aircraft, politics, history, geography, the inner workings of computers, and many more things.
Even my daydreams evolved. I was a terrible student and about 50% of my not-writing-anything-down time in school was spent staring blankly forward daydreaming about stuff. When I was younger it would be daydreams of owning a chameleon, my most coveted reptile pet that I never got. Later it was about videogames I wanted to get home to play, later it was about the girls I liked in school.
Everybody evolves as a person.
I think what the OP is asking is whether the actions of the pituitary gland can be attributed to changing interests. I'm not qualified to answer that. But my interests did change at that age.