If Minerals, Vitamins are zero calorie food than why do we need them?

If Minerals, Vitamins are zero calorie food than why do we need them?
The Vitamins mean”life substances” or “life elements“. Vitamin 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 of they are Oxygen, Nitrogen, Carbon, Chlorine, Fluorine, Phosphorus, Iron, Calcium, Potassium, Magnesium, Hydrogen, Sodium, Sulfur, Silica, Iodine, and Manganese. Every element has to perform a special duty and if the blood and tissue building ones are not supplied in sufficient quantities or if any of them are missing, health will soon become impaired.  Although the mineral elements make up only a 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”.