Re: does levothyroxine make you gain or lose weight?
T4 supplements do not make you gain or lose weight. If you are under treated and your T4 and T3 blood concentrations are insufficient resulting in an under active thyroid condition. You are at a higher risk of gaining weight despite extreme exercise regimes and dieting. If you are optimized.. then you have the ability to gain or lose weight depending on your diet and life style. If however you are over medicated and you T3 and T4 blood concentrations exceed your optimal level you will enter a hyperactive or over active thyroid state. When your thyroid is over active you are at an increased probability to lose weight. However depending on the degree of hyper activeness you can gain weight if you eat in excess in response to the hyper promoted hunger urges. Thus gaining or losing weight is not the specific drugs fault but rather the fault of the current state of the thyroid.
If we learn by our mistakes, I am working on one hell of an education.