Omega-3 fatty acids are essential for the thyroid gland. Tuna and salmon are good sources when it comes to fish caught in the sea rather than those grown in fish farms. In fact, for the fish to have omega-3 fatty acids, fish need to eat algae.
Flaxseed helps the thyroid gland (grind it in a coffee grinder and put it in a yogurt, salads, and soups). In cooked dishes add it in already cooked meals, but not before it. Choosing healthy cooking oil is essential for the thyroid gland. Olive oil and canola oil are good choices. If you already have a problem with the thyroid gland before you choose any of these foods consult your family doctor or specialist.