Everyone knows that caffeinated beverages will give you a small froth if you dump them in a glass. The Dutch apparently require a good a amount of froth in their beer. But at the same time Blue Gatorade has the same consistency as my pee, but my pee froths 10x as much when I shake a pee bottle. Why come?
In: Biology
So caffeinated beverages in themself will not froth, necessarily. Coffee froths because it have proteins in it that form structures that trap air bubbles (look up coffee foam). Same goes for dairy milk in a latter. Almond milk has a lower amount of protein (or at least that kind that make structures) so it takes a skilled hand to make them froth.
Your pee will froth if it has tons of carbohydrates in them (which is a bad sign). Carbs are why you can make Gatorade frothy too. Carb structures are weaker than protein structures which is why they fizzle quicker and make less foam.
Beer has little bubbles of carbonation from the yeast eating and pooping out CO2, which collects into small bubbles. Beer has carbs but they aren’t typically whipped into structures, so it’ll go flat fairly quick.
Soda has bubbles added artificially. It stays bubbly because the bottle/can is pressurized.
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