What disorder of the endocrine system is caused by a lack of iodine in the diet

In many parts of the world, the soils are naturally deficient in iodine, and iodine deficiency disorders due to hypothyroidism will occur without iodine supplementation. Thyroid hormone has a crucial role in the development of the nervous system, being involved in the growth of synapses and the formation of myelin.

Probably because you wake up early. even when i get a good nights sleep i still feel tired if i wake up early. or maybe you just need coffee.