: Due to the presence of iodine in seawater, marine fish is one of the main sources of iodine in human diet. Eating iodine-rich foods produces thyroid hormones. It has been observed that areas far from the sea, such as Nepal in the foothills of the Himalayas or North Bengal in Bangladesh, have a high incidence of goiter or goiter . Deficiency of thyroid hormone hinders the mental development of children. The skin is rough , the face is gaunt and the appearance is different from normal babies. Lack of iodine disrupts the growth of hormones, which slows down the growth of children. For this, the use of iodized salt in food is beneficial. In addition, eating bananas , fruits , kachu , marine fish, etc. can get rid of this problem.