Thyroid hormones influence your metabolism or how your body uses energy. When your thyroid hormone levels are too high, your metabolism speeds up. Low thyroid hormone levels -- hypothyroidism -- causes your metabolism to slow down. The production of thyroid hormone depends on a constant energy source. Restricting carbohydrate intake can decrease your thyroid’s ability to produce and secrete thyroid hormone. Ultimately, this can leave you feeling more tired or sluggish. #thyroidhealth #midlifenutrition #hormonebalance #perimenopause