The Body Ecology Diet by Donna Gates.
Someone there states:
I don't think that you will find a tradtional doctor that believes that there is such a thing as leaky gut.
I too was diagnosed with this many years ago.
People who have this are told they also have yeast.
Yeast burrowing in your intestines is what usually causes the leaky gut.
The best book I know to help such a condition is The Body Ecology Diet by Donna Gates.
Ignore the theory about eating right for your blood type.
This is just a theory (as she says in the book) and one that is true nonsense.
Good luck!