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Thyroid problem is caused by iron deficiency. Iodized salt is a kind of salt that contains iodine and iodine intake may prevent thyroid problems
Our body needs iodine. but since the body cannot naturally produce this, we get iodine from food. it is needed for the production of thyroid hormone, if we dont have enough of this in our body, we will acquire iodine deficiency which will lead to hypothyroidism, goiter etc.