The other night I was out to dinner with co-workers for sushi (mostly sashimi for me) and we did a couple of shots of sake.
The next morning I was experiencing my usual side-effects of having been wheated and I couldn't figure out the culprit until I thought about the sake. I had assumed the sake would be safe; it's just wine made from rice. But I went to The Google and quickly found that for the reasons of cheaper production and taste (and probably pleasure / addiction), it may be made with barley, wheat, and soy (just like so many other products). Son of a gun! I won't be making that mistake again.