[mikk0j]

That's it. I had to read this far before I realized that's exactly what their core is: "trying to normalize liquid diets" (as in make them normal, acceptable, approachable, I think?). There's nothing natural (as in biologically normal, desirable or standard) about a liquid diet, so that's going to be an uphill battle.

[aianus]

I have some kind of psychological problem where I chew 5x more than normal people. This causes me to fill up on very small quantities of food and it's very difficult to hit 2000 calories a day without eating a lot of small meals or taking liquid supplements. So, at least for me, a liquid diet would be highly desirable.

As for biologically normal, it all turns into a liquid sludge in your stomach, doesn't it? Past that point I don't see how your digestive system can tell the difference as long as the composition of the sludge is similar enough.