Spices and complementary vegetables like onions or peppers being absent in a meat only diet make this a no brainer. Sure I'd miss cheese, but picking meat in this situation is honestly a bit unwise.
What do you get out of that animal diet? Mostly muscle protein and fat (the really yummy part). Fat is easily obtained from various vegetable oils, so you're only missing out on those proteins. Much fewer unique flavors come from animals (RIP "vanilla" flavor from beaver assholes).
I'll be plenty happy with sugar, bread (assuming yeast is allowed), salt, pepper, jalapenos/habaneros, curry spices, rice, vegetables, fruits, nuts, and "beyond" meat. There's a reason Beyond burgers aren't that bad, it's because they imitate texture and use the complementary flavors of lettuce, bread, tomato, etc to bring that burger together.