There seems to be rather a dearth of literature available on the topic of picky eating for adults, and what there is on picky eating relates mainly to children, and focusses on the fact that most grow out of their picky eating. Hopefully this situation will change, but in the meantime, I have put some of my recommendations on here – click the link to browse them.
I have just discovered there is a man in the US who is writing a book about Selective Eating Disorder (as picky eating is also known). His name is Adam Gibson. I gather he is also looking into making a documentary on the subject. If anyone in the US would like to help with getting the documentary made, his email is firstname.lastname@example.org