This.

There are far more factors than that. Residual sugar is one several things that causes the lattice. Unfermentable sugars, which often don’t taste sweet and can (and often should) appear in well attenuated beer. Proteins. And other compounds all contribute to head retention and body. And its head retention and body…

I dunno what the videos on about. But serving properly poured, good beer in a clean glass will see the head cling fairly tenaciously to the side wall of the glass. This will keep the head from “slipping” off the liquid beer (so you don’t end up sipping liquid with no foam). And also leaves whats called a lattice,…

That sounds like BS. First alcohol is an irritant to mucus membranes and and the digestive tract. It causes “digestive issues”, that’s just what it does. A well established, medically proven, side effect of excess alcohol consumption.

Second the amount of soap residue involved is typically incredibly small. In most…