The thyroid, a butterfly-shaped gland that wraps around your windpipe, secretes hormones that regulate your metabolic rate. If you’ve gained weight recently, someone may have told you to have your thyroid level tested. It’s true: low thyroid levels, a condition known as hypothyroidism, can cause symptoms such as fatigue and weight gain. But this problem, which can be diagnosed with a simple blood test, is rarely the underlying cause of weight gain.
Source: George L. Blackburn, M.D., Ph.D., "Break Through Your Set Point: How to Finally Lose the Weight You Want and Keep It Off," 2008
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