The inability to lose weight despite increasing exercise and decreasing caloric intake may be due to low thyroid levels. An underactive thyroid gland can drastically slow down your metabolism, making weight loss a near impossibility. Without correcting thyroid levels, if you're suffering from an underactive thyroid, also known as hypothyroidism, you may continually struggle with your weight, not only having difficulty losing weight but also potentially gaining while you are working hard to lose it. Alternatively, an overactive thyroid gland, also known as hyperthyroidism, can drastically speed up the metabolism, causing the body to burn calories at a faster-than-normal rate resulting in unexplained weight loss.
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