I found this brief bit about
arsenic and rice.
www.webmd.com/diet/features/arsenic-food-faq?page=2 It's just the first part of the article.
And another.
chriskresser.com/arsenic-in-rice-how-concerned-should-you-be My daughter, who doesn't like brown rice, always reminds me that white rice is safer.
Have you tried quinoa or millet?
9 grain bread might not agree with you.