This document discusses minerals in the human body. It explains that minerals are natural chemical compounds that make up the crystalline structure of tissues and help various body functions, but humans cannot produce them. The body consists of around 29 different mineral elements that are divided into five groups based on their daily requirements and effects of deficiency. Group I elements like carbon, hydrogen, oxygen and nitrogen are components of macromolecules. Group II macro-minerals like sodium, potassium, calcium and phosphorus are required in amounts over 100mg daily and deficiencies can be fatal. Group III trace elements under 100mg daily like iron and zinc are essential and deficiencies cause serious disorders. Group IV elements may be essential but their roles are unknown, while Group V elements