This is totally shocking - my mother in law used to always bring loaves of poppy seed bread, which her whole family loved including my husband, and which they consumed all their lives and it is still available today at the local bakery.
I mean this is a thin sheet of bread coated with about 1/4 inch of poppy seeds then rolled to the size of a nice big french loaf of bread, and then after baking the thin layers, the slices are cut - each containing 1/3 cup of seeds each (give or take).
I can't say much about the effects since I do not like bread or sweets, so I did not really sample it - but it is amazing that this could affect people so.