If minerals, vitamins are zero calorie food then why do we need them?

If minerals, vitamins are zero calorie food then why do we need them?
The vitamins mean “life substances” or “life elements”. Vitamin is a name derived from the Latin word “vita” meaning life and “amines” or amino acid, which are component parts of the protoplasm.

Vitamins are undoubtedly essential to life and are builders of our bodies. There are sixteen chemical elements of which the body is composed. They are oxygen, Nitrogen, Carbon, Chlorine, Fluorine, Phosphorus, Iron, Calcium, Potassium, Magnesium, hydrogen, Manganese. Every element has to perform building ones are not supplied in sufficient quantities or if any of them are missing, health will soon become the comparatively small amount of the body, say about 5 percent, they are nevertheless essential constituents and every single element has some distinct physiological function to perform. The normal and healthy development of the organism primarily depends upon the adequate supply of the organic salts, which truly may be called “the building stones of the body”.