I don't know why either. My doctor looked at my funny when I told him that I get these pains from caffiene AND from sugary treats. Not sure why but here is what will give me an attack.
3 SIPS OF COFFEE (caffiene is the worst for me)
2 HIGH FAT MEALS (I don't get it just from 1)
2 PIECES OF PIE
1 CHOCOLATE CHIP COOKIE
What gets rid of a gallbladder attack:
1 CUP OF ALOE VERA JUICE
I think a lot of the sweets we eat has fat in it too. Anyhow that is my experience.