> Except you can check the differences easily

Huh? No you can't. Without regulation or oversight, companies will simply lie about what's in their product.

The libertarian vision really handwaves the practical reality of "I'll simply do a gas spectrum analysis on every single bite of food I put into my body. Easy!"

> Take a walk, that will help you a whole lot more, and won't make you poorer.

OK, before the 1906 Pure Food and Drugs Act and Federal Meat Inspection Act, food was frequently adulterated with e.g. formaldehyde in milk, borax in meat, copper salts in canned vegetables, and chalk/plaster in flour or milk.

Before the 1938 Food, Drug, and Cosmetic Act, kids candy was dyed with toxic coal-tar. And on top of that was frequently contaminated with arsenic, lead, and mercury.

So please explain to all of us how taking a walk is going to save us from these issues.