Sad? Cold? Hot? Wired? Blame the thyroid. In your throat there is a butterfly-shaped gland under a shield-shaped Adam’s Apple and it controls how you feel. We asked Thyroidologist and surgeon Dr. Kepal Petal of NYU Langone Hospital about everything from how to decipher TSH to T4 to T3, libido factors, radioactive cats, stress and thyroids, how diet can affect them, flim-flam and how being on TV might save your life.