dessicated thyroid and weight loss

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I began taking dessicated thyroid 2 months ago and lost 20 lbs quickly after years of synthroid, and being overweight. I have not lost additional weight which is good in my case. My mother began dessicated thyroid about 6 weeks ago. She is 75 and hypothyroid. She never gained weight with hypothyroid. Now, on the dessicated thyroid, she is loosing weight she cannot afford to loose!! Her doctor initially did not give her an adequate amount of the thyroid and she went downhill. The doctor increased her thyroid by 1/3, and her symtoms appear to be ok now, other than the weight loss. Does anyone know anything about this??