I bought a case of those quite a long time ago and I don't recall suffering any side effects but I believe if you read up it is considered a possible side effect. A lot of ppl have the same issues if they increase their fiber intake. I think it takes the body a while to adjust to change, even a healthy change...lol.
How do you like the noodles ?? I couldn't adjust to the texture and ended up giving away the last few packages to a friend who said he didn't mind them , but he never ordered any after he finished them either...lol.