I find this plausible, but I think it's about powdered proteins generally, or at least many of them.<p>I tolerate dairy well, although I only drink small amounts of sweet milk and cream, eating mostly yogurt and cheese. I like to make strained yogurt / labneh, and I'll drink the whey by itself (I like pickle and sauerkraut juice as well).<p>But when I add whey powder to a shake for the gainz, my stomach really doesn't like that as much. It doesn't cause <i>problems</i> or I wouldn't eat it, but it's just a bit gassy and sometimes irritating.<p>I've noticed much the same thing with the pea-protein based vegan meats. I believe it's difficult to extract proteins without denaturing them somewhat, collagen is an exception but not a vegan one.<p>I like eating peas just fine, peas don't give me gas and lentils rarely do (that's it for me and pulses these days), but the extracted protein, not so much, doesn't sit right.