i think there is something here, and as many know, zinc causes loss of sense of smell...which many PWP have as one of the early symptoms.

Here is an article, I think done by the same facility that did the research ST shared, from 2010:

http://aja.sagepub.com/content/25/7/572.abstract

BTW, selenium and copper are critical too, all minerals are vital and cannot be made by the body like most vitamins can, so we must get them from external sources....food (which may or may not provide it, depending on the soil where it is grown) or supplements.