Yes, there are concerns about phytoestrogens in soy. But your boys aren’t going to eat the wax paper, are they? And do you think a significant amount is going to transfer to their food, especially if we are talking a cold sandwich? Also, soy wax is made from soybean oil, which does not contain much in the way of phytoestrogens.

Finally, that soy oil is highly processed to make soy wax (by proprietary industrial processes, btw, though we know at least that hydrogenation is involved), so we don’t really know if any health benefits or risks that apply even to soy oil apply to it. Since it is a highly altered form of soy and the fact that is “soy” is practically meaningless except regarding its source.

So I really don’t think you need to worry about estrogen effects. On the other hand I’m not aware of any studies, certainly no long term studies, that have been done on the health effects of soy wax at all. It was years before the leaching effects of plastic on our foods came out, so I wouldn’t be all too confident that soy wax is safe.

Personally I’m going to be careful about heating food with it touching, but will continue to use it to cover things in the fridge (such as over a bowl with a rubber band to seal it).

Anyways, great ideas here! I knew they used wax paper for bread loaves in stores years ago, before plastic and that is what sent me searching for info just now.
Thanks!