In addition to gastrointestinal and blood sugar disorders, adrenal gland dysfunction is the most commonly seen imbalance in today’s society. Adrenal gland imbalances are also one of the major factors that cause thyroid hormone imbalance. Stress from work, relationships, electronics, poor diet choices such as consumption of refined carbohydrates and trans fats, infections, and environmental toxins all contribute to adrenal disorders.
http://drhedberg.com/2011/02/24/the-thyroid-adrenal-pancreas-axis/