Why iodine is important to our body?

Iodine is central to healthy thyroid function. The thyroid gland uses iodine to make thyroid hormones. These help with, brain development, growth, healing, energy-yielding metabolism. Iodine deficiency occurs when your body lacks iodine – an important trace mineral. Cells need iodine to convert food into energy. Iodine supports the thyroid gland in your neck. Your thyroid uses iodine to make thyroid hormones, which control the rate of heartbeats, digestion and other functions.
What does iodine do?
Your thyroid, a small, butterfly-shaped gland in your neck, uses iodine to make hormones that help your body do lots of things, like make energy and keep you warm. These hormones are also important for a baby’s bone and brain development before and after birth. Your body doesn’t make iodine, so you have to get it from food or supplements.Doctors can test your pee to see if you’ve had enough iodine recently, but that doesn’t necessarily show if you get the right amount over time. These tests do, however, help scientists figure out which groups of people are most likely to lack iodine in their diets. Americans generally get enough, but people in parts of Asia, Africa, and Europe may not.
Hypothyroidism :Seaweed can be a great source, though the amount per serving varies depending on the type you eat. Iodine is also in eggs, dairy products like milk, yogurt, and cheese, and seafood like shrimp, tuna, and cod. When you see foods labeled “iodized,” like salt, it means they have iodine added. You should be able to get enough from iodized salt, but keep in mind that the salt added to processed foods, like chips or canned soup, often has zero iodine.

What happened when we take too much of iodine:
High levels can inflame your thyroid gland and can cause some of the same symptoms that low levels do, including a goiter. A very large dose, like several grams of iodine at once, could put you in a coma. It also might burn your stomach, throat, or mouth, and cause a weak pulse, nausea, vomiting, and diarrhea. Even “normal” levels can cause problems if your body is used to much less iodine in your diet, or you already have thyroid problems.
Low iodine problems:
One of the most common results of low iodine is that your thyroid can’t make enough thyroid hormone, a condition called hypothyroidism. This might inflame the gland and cause a goiter, but not always. It makes thin hair, dry your skin, and make you feel cold, tired, constipated, and depressed. And you might gain weight more easily. But symptoms can take years to appear. Talk to your doctor if you notice any of these signs.
Here are 11 signs that suggest a person may have an iodine deficiency. Putting bone weight, feeling weak, feeling tired, losing hair, drying skin, feeling cold, having a slow heart-rate, learning or memory problems,  Pregnancy complications,  heavy or irregular periods, swollen neck.
A person needs to consume 150 micrograms (mcg) of iodine each day to maintain a healthy level for their body.