The document discusses deficiencies of several key minerals including calcium, phosphorus, and iron. Calcium deficiency can cause rickets, osteomalacia, osteoporosis, and muscular disorders. Symptoms include muscle cramps and brittle nails. Treatment involves consuming calcium-rich foods and supplements. Phosphorus deficiency leads to rickets, osteoporosis, and osteomalacia, with symptoms like bowed legs and soft bones. Iron deficiency results in anemia and fatigue, with pale skin and shortness of breath as symptoms. Treatment focuses on consuming mineral-rich foods and supplements.