Winter Diets and the Elusive Mineral

If perchance you are one of the rare individuals who passes thru winter without colds or grip, or one whose vitality at the close of winter is 99.44%, then you will not be interested in my story. However if you are not, and if by next March you will be "below par" and will have had several colds of varied duration and intensity, then perhaps a timely word on diets and minerals in particular may not be amiss.