There are foods that you can choose to increase the activity of you thyroid. Go for one of this, go for a serving of what each of these foods at least once a day. So for instance, something is rich in vitamin A. Vitamin A activates the function of the thyroid hormone in your body. Maybe a glass of tomato juice, or a serving a sweet potato about the size of your fist, preferably at your evening meal.
You also need sources of iodine in your diet every single day. Iodine is essential for the production of thyroid hormone by the thyroid. So think of seafood, shell fish, spirulina all of this foods can be added easily to your diet. Next you have tyrosine, tyrosine is special amino acids that combines with the iodine to make Thyroid hormone.
Think of low fat protein sources, things like egg whites, turkey and cottage cheese. And then we can't forget serillium which is one of the most essential minerals that we have, for the function of thyroid hormone in the body. So, if you don't have enough selenium in your diet, you can get the symptoms of hypothyroidism so your best choice for selenium sources is a brazilian nut maybe one or two a day, be careful that you don't eat too many because it is very calorie dense.