In short, let's see what are the risks that a vegetarian, vegan or macrobiotic can manifest; their followers must necessarily be aware that... A poor diet and more and more you will run the risk of clinical or subclinical vitamin deficiencies.
Vegans must take care to employ the right percentages of vitamin B12, vitamin A, riboflavin (vitamin B2) and also vitamin d. those who follow diets including macrobiotic diets little vegetables and fruits (no citrus) should monitor the percentage of vitamin C.
In addition, the low consumption of animal products, which often characterizes these diets can cause, among other things, a vitamin A deficiency.
For vegetarian diets, however, do not pose any major problems as long as the menus propose a variety of cereals, fruits and vegetables. In this case, indeed, the vitamin may be even higher in quality and quantity to that of traditional diets: more: vitamin C, plus folic acid and, if the diet includes whole grains or low-profiles and (or) yeast and wheat germ, more vitamin B1 and B2.
Beware, however: if it is true that often the vitamin for vegetarian diet is complete, you can not say the same thing of minerals.