Naturally Brewed Condiments, Not Hydrolyzed

What I do

Traditionally fermented soy sauce rather than the hydrolyzed vegetable protein version, and the same preference wherever else the choice shows up.

What the difference actually is

Brewing takes months. Koji, salt, soybeans and wheat ferment slowly and the flavour is a product of that process. The industrial shortcut hydrolyses the protein with acid in hours and adds colour and flavour back, producing something compositionally different that is sold as the same thing.

The acid route also carries byproducts the slow one does not — chloropropanols being the ones that get regulated attention.

Keeping this in proportion

At the volumes anyone actually consumes soy sauce, this is a small effect. I am not going to inflate it.

The reason it is a standing preference rather than a considered decision each time is that the better version costs roughly the same and tastes better. When the cost of the more careful option rounds to zero, it becomes the default and stops taking up any thought.

What to look for

The process, not the marketing. "Naturally brewed" is on the label of the real thing; the shortcut version lists hydrolyzed vegetable protein in the ingredients. That line is the whole test.