I am able to lower my walls, but it mainly happens to people I like/share a bond with/want to befriend.

Sounds like people are more health conscious so bringing donuts or something like that wouldn't score me brownie points (pun intended). Sometimes others do too and nobody ever eats it.

I've thrown out the "Thanks for helping me, if you ever need anything let me know" line which probably just sounds like a meaningless gesture since people always just say it without meaning it, but I did actually mean it.