Eh. Grow beef mostly grazed on marginal land that can't support other agriculture.

This is how a LOT of beef is produced and how most of it SHOULD BE.

They're not "lost calories" if they're produced on large swaths of semi-arid land that don't support any other kind of agriculture.

And on the opposite side... a LOT of those "lost calories" are corn. Corn is substantially more productive than other crops and people don't want to replace large portions of their diet with cereal grains or corn syrup so much of those "lost calories" would also be lost to much less efficient crops.