This stretched my mind like a rubber band for a moment.
It is more expensive, but apparently there is a difference. Eating vegetables and beans is also good.
For mattresses, Obasan and Sleeptek use wool and have not been treated with flame retardants. Essentia mattresses bought in Canada also do not have flame retardants, but if they are purchased in the US, they use a Kevlar flame retardant, (which is supposed to be safer than the usual ones.)