On a per-calorie basis, yes. Animal protein requires 10x the input of what you get back: 100 calories of chicken requires 1000 calories of feed. Now what we feed livestock is unlikely what most people would want to consume, but the systems are in place to allow such a transition.

Last time I looked it up, the US produces something like a ~million+~ kilograms of corn for every person in the country.

Edit: it was pointed out my corn estimate was off, and it is order of magnitude 1000kg per person.

> Is that even possible with the current food supply chain though?

Yes. Potatoes, onions and beans have are healthy, cheap and well-supplied staples. And I absolutely notice when I’m on a bean and onion week versus a sandwich or rice week.

Obviously. But you also need the time to cook and not to have the appetite of a 10 year old. The latter, from what I've observed, is quite common in grown adults.

Naturally any overnight change that drastic would collapse the global economy and society would collapse. But given some time and will, I don't see why not.

It absolutely is in Australia, and I suspect Europe (from when I went 5 or so years ago). Even mostly possible in Houston when I was there 15 years ago.

The US is even more cooked than I thought if you can get a bunch of fresh veggies from a grocery store.

> Is that even possible with the current food supply chain though?

Given that vegans exist, i'm going to say yes, its entirely possible if you feel like it.