Unexpected Weight Gain
Thyroid hormones control how the body burns the calories you eat, so it is no surprise that when there is iodine deficiency, you may experience significant weight gain [4]. You may not be eating more than before, but because your metabolism is very low, you tend to gain weight unexpectedly.
When your thyroid hormone levels are low, the body isn’t able to quickly convert food into energy and heat. This process becomes slower than normal, leading to fewer calories being burnt and most of your food being stored as fat.
Fatigue and Weakness
Studies have shown that persons with iodine deficiency often complain of constant fatigue and weakness. This shows that the thyroid hormone is important to keep you sharp, active, and energized all day long. Up to 80% of people with low thyroid hormone levels have had problems staying sharp and ready to go.