The Thyroid Gland

The thyroid gland is the largest endocrine gland in the body. When functioning optimally, this butterfly-shaped gland in the neck secretes just the right amount of thyroid hormone to regulate most metabolic processes in the body. Thyroid hormones control how quickly the body uses energy, the production of proteins, blood calcium levels, and how sensitive the body is to other hormones. Even slight changes in thyroid hormone levels can cause drastic changes to energy, weight, and mental functioning.