Hi mrsd!

I am not sure if your question was directed at some of what I'd written in my post about protein powders and I certainly don't want to "hijack" anyone else's thread... incase it was directed at my statement, I also don't want to ignore your question!

You are much better informed than I am about these matters.
Your question had start me questioning the same.
For so many years, I have heard people telling me how hard protein powders are on their stomachs. I have also heard docs mentioning many people come to them with GI problems from the protein powders (especially if they use the powders frequently.)

So.. I am wondering if some of this has a great deal to do with how which forumulas they are using and how they each tolerate the formula?

I had assumed all were pre-digested, yet I just went to the cabinet to look at one of my dh's protein formuals. This is a simple whey protein formula without any herbs, etc. It says: "Predigested Whey, such as that found in peptides and hydrolyzed Whey products, results in a loss of glutamine. Therefore, (name of manufacturer) Whey is not hydrolyzed."

Might this be the explanation in some cases? Maybe some are not pre-digested?

(Additionally, I find when people use a fair amount of protein powder, the protein increase, without fiber increase, etc., causes them a great deal of constipation. Yet, one could overcome this type of a problem by making some dietary modifications. I think everyone realizes the potential for this type of a problem with increased protein intake.)

I think the current issue about protein and GI more relates to other potential issues (other than constipation with increased protein intake) with various protein powder formulations?

If so, it would make sense to use pre-digested formulas if having GI difficulties, as you have mentioned!

Any other thoughts from anyone?

I hope everyone is having an enjoyable day!