Connection between low thyroid, soy and weight gain
by Savvy Vegetarian
(USA)
I've heard about this enough from various women, and read enough about it to believe there's some reality to it: soy isn't good for women with low thyroid, it makes them feel sluggish, and gain weight. Plus, I don't think that relying on one food -soy- for most of your protein is a good idea for anybody regardless of the as yet unresolved soy issues. Since that's the case, it makes sense to be cautious about soy.
IMO, for optimum nutrition, vegetarians and vegans need a wide variety of fresh whole foods, including beans, whole grains, nuts & seeds, veggies & fruits. If they have that, they don't need soy. I've heard from way too many vegetarians who believe that if they don't eat lots of soy products at every meal as a complete protein substitute for animal foods, they'll surely die of malnutrition. It all comes back to the many misconceptions about protein in our culture.
-Savvy Veg has published a number of articles about the subject.
E.G. http://www.savvyvegetarian.com/articles/get-enough-protein-veg-diet.php