They meant two different groups, one with soy and one with egg.

By the way, the trypsin inhibiting effect is not present in tofu and tempeh products. It is also eliminated if soybeans are cooked well. I'm not sure about TVP (textured vegetable protein, which is actually soy) but I've heard that many of the manufacturers take pains to eliminate the trypsin inhibitors. I would have to contact them to be sure. The trypsin inhibitors make soybeans hard to digest. I'm not sure that sweeping statements like the trypsin inhibitors cause chronic defeciencies in amino acid uptake are accurate. I think it is only an acute effect. However, if the large bulk of your protein intake is in the form of soy protein powder, then change that word to chronic. Therein lies the problem.

I don't think that eating a moderate amount of soy is going to cause chronic anything.

Phytic acid is a bean and grain thing. Soybeans do contain a large amount of it. Again, not a problem in the traditional soy foods. Easily eliminated from beans and grains by soaking and rinsing.

Let me be the devil's advocate. Ever hear the expression everything in moderation? It's a pretty useful saying. And it applies to just about every food you can imagine. Soy has sometimes been linked to thyroid problems. Guess what? Broccoli, one of the most revered vegetables around, contains five, count them, five goitrogenous compounds that interfere with the use of iodine in the thyroid. Does this mean that you are likely to have a problem even if you have thyroid deficiency? Probably not. You are just not likely to eat enough of brocolli to cause the effect.

Here's a shocker: brocolli juice is not good for infants. No surprise there, right. Yet it seems to come as a surprise that soy based infant formulas are not such a good thing. If someone was to start marketing a broccoli supplement for infants, and then babies started dying, would we attack broccoli? Or, if someone was making highly concentrated brocolli body building supplement (hypothetically), and it was linked to all sorts of negative effects? I don't know if we would condemn broccoli, but it would be silly to do so.

Much of the negative press that soy gets is because of its use in infant formulas. That's one of the things that started the whole debate. Infants and adults are not the same, right? They cannot eat the same things, and things affect them differently. Kind of like humans and rhesus monkeys.

You shouldn't eat huge amounts of broccolli or any other plant, for that matter. That's why I'm comparing soy and brocolli. They are both of the plant kingdom and they both contain powerful chemicals. I could give a long list of plant foods with similar attributes. Constituents that may beneficial in moderate amounts and harmful or even posonous in large amounts.

Tomatoes, for instance. They are of the nightshade family. Potatoes and eggplants too. Contrary to popular belief, it's not just the tomatoes plant that contains the poisons, the fruits do too, only in smaller amounts. Kind of makes it seem like you could eat too much tomato, doesn't it? Especially if it was some kind of tomato concentrate. Try eating 100 grams worth of double concentrated tomato paste a day for a couple of weeks and see how it works for you. Sounds ridiculous doesn't it?

So, I disagree that soy is bad. I agree that soy protein powder is bad or at least not a good idea. I wouldn't touch it. I don't think for a second that soy, as it has been traditionally consumed, in moderate amounts is a problem. I'm also not going off of broccoli and tomatoes.