Hi, Caren:
I’ve read that soy is, in some form or other, on the list of foods that can interfere with synthroid absorption, if taken at the wrong time, or in the wrong amounts. As I understand it, this does not mean we have to forever avoid it. Consistency is the important ingredient with the synthroid. So, if you add soy to your diet, it would make sense to have your blood levels/TSH checked after six weeks or so to make sure that your new regime hasn’t interfered with the synthroid. If it has, then the docs can adjust the synthroid accordingly.