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.