ron,
i have to say i'm a little skeptical. if zinc deficiency was increasing the probability of pd in the U.S./BRITAIN, i think we would see clusters of pd/ms/mental disease, and especially in the 3rd world where there is a lot of malnutrition. there has been clusters of dwarfism in egypt caused by zinc deficiencies from eating nothing but whole wheat products but no pd clusters reported. phytic acid found in the seed coat is a powerful chelator. during WWII, the increase in rickets in childen was attributed partially to the requirement that whole grain flower be used to make bread.
http://www.idpas.org/pdf/3198Recogni...Deficiency.pdf

the author you cited has no credentials except he is a health writer.

i did my master's thesis on phytic acid in oats.
zinc is important in prenatal, a growing child, etc. but pd imho is quite a stretch.