Hi!! Technically, in the original protocol....no. But...I have eaten it on every round and always lost with it. I use the excuse that in Dr S's day, all canned tuna was packed in oil, not water....so obviously it would be a no go on p2. For me, I can't eat alot of the allowed fish, so it was a necessity to try the tuna, just to have something different. My advice is to try at your own risk, see how you do. Get good albacore tuna....not the cheap generic stuff.