The only thing I could find on this when I googled for an answer was
I found it on a couple of different sites that pretty much stated the same thing.http://unh.edu/health-services/self-care_constipation.htmlThat was the site I found this on.That was a good question. I don't know if this helps any, but you could do some more searching on your own and if you come up with something different, share it on here, ok?