(Don't know if that's what they're called, closest thing I can remember).

 

Basically in the Vithrack area in White March II you can get those food items that give you +4 intellect +4 perception, but sickens you. I absolutely love them, the last one I had proved pivotal in destroying the bog dragons and archmage (made the area of effect of my rain of fire and pillar of fire so huge that i could wipe out everyone with just a couple casts). Just wondering if the ones you found in the area were the only ones you can get, or if there's a way to get more.

I never had any more, but if you've beaten the bog dragons, there's no real need for them.