There are always deficiencies in certain nutrients, primarily those which take part in sugar metabolism such as zinc, magnesium, chromium, manganese, and other minerals, as well as vitamins primarily of the B vitamin group.

Make this lower case
there are always deficiencies in certain nutrients, primarily those which take part in sugar metabolism such as zinc, magnesium, chromium, manganese, and other minerals, as well as vitamins primarily of the b vitamin group.