A well-functioning thyroid keeps your metabolism humming. That’s because the thyroid hormones act like a throttle, boosting your body’s ability to burn calories. However when your thyroid is underactive your metabolism slows to a crawl and you burn far less calories. The result? It becomes next to impossible to lose weight when you have a sluggish thyroid.
Do you have an underactive thyroid and are worried about ongoing weight gain? Fad diets and cutting calories simply won’t work when you thyroid is out of sync. There is a scientific explanation as to WHY.
You see the thing is, when you cut calories you switch off an enzyme with the complex name of 5″-monodeiodinase. This enzyme plays a critical role in initiating the conversion of thyroxine (T4), one of your key thyroid hormones through to the more potent thyroid hormone called triiodothyronine or T3 for short. The body inhibits this enzyme as a way to conserve fuel during periods of starvation. These days, it’s a natural, in-built response to dieting. A drop in T3 slows your metabolic rate which blocks fat burning. Your metabolism then becomes even slower and calories are stored, not utilised for much needed energy.