Hypothyroidism is a complex disorder that can stem from a number of different causes, including: 1  The thyroid may fail to produce enough thyroid hormone as a result of an autoimmune response against the thyroid (Hashimoto's thyroiditis) or other problems with the function of the thyroid gland itself.
Chicken, lamb, pork, and turkey also are good sources of iron. Meat contains heme iron, which is easier for the body to absorb, meaning you get more of the iron from these foods. Lean sources of beef are recommended.
Spinach may not give you superhuman strength to fight off villains like Popeye's nemesis Bluto, but this leafy green and other foods containing iron can help you fight a different type of enemy -- iron-deficiency anemia.