The thyroid gland covers the windpipe from three sides. The hormones of the Thyroid gland, T3 & T4, help the body to produce & regulate adrenaline, ephinephrine, and dopamine; all three of which are active in brain chemistry. Other hormones from this gland also help regulate metabolism. Without a functional thyroid, the body would not be able to break down proteins, and it would not be able to process carbohydrates and vitamins. For this reason, glandular problems can lead to uncontrollable weight gain. For many people, these irregularities can be controlled through medication, as well as an attention to their diet. However, there is one other controlling factor. The gland cannot produce hormones on its own. It needs the assistance of the pituitary gland, which creates thyroid stimulating hormone (TSH). As a result, a nonfunctional pituitary gland will eventually lead to thyroid-gland-related issues. TSH will either trigger the production of thyroxine and triiodothronine. If TSH is not present at the right levels, too much or too little of either hormone will be made.