Re: Do protein drinks affect thyroid??
Here was an article I found that suggests the problems with soy and hypo!:
Soy has long been implicated in diet induced goiter. Since the consumption of soy products is increasing dramatically (soy latte anyone?) researchers are trying to define the component responsible. While all the studies mentioned above were on animals, we do know that in babies who have hypothyroidism at birth and require replacement therapy, we need to increase the amount of replacement they are on if we switch their feeds to soy milk. Whether this is because of an absorption problem, or a direct interference of soy with the action of the hormone remains unclear.
What does this mean?
In a short summary, soy does seem to have an effect on thyroid hormone status, in animal studies, and by observing children on soy milk with underlying congenital thyroid problems. We don't know the exact mechanism of the interaction with soy and the thyroid. We also have no studies that appropriately address the issue of thyroid replacement therapy and soy consumption.
How does this effect you?
A good rule to remember is that too much of anything is not healthy. At present we have no reason to say that soy should be avoided in patients on synthroid. And don't forget the health benefits associated with soy, such as reduced cholesterol levels, and improvement in menopausal symptoms. In general, I recommend patients consume no more than 60g of soy a day, and this may vary if there is a history of breast cancer. If you are concerned about your dosage of replacement therapy, or you have made a dramatic dietary change recently, I suggest that you get your thyroid hormone levels checked by your physician. It's quick, easy, and can help to optimize your management.
I hope this helps to answer any questions you may have about soy and thyroid function.
Medical Author: Ruchi Mathur, M.D.