Reading up a bit more about the Inuit diet that the Arctic explorer went crazy for, it worked because they ate a wide variety of animals, the meat tended to be high in fat, and they'd eat any part of the animal that was edible, not just the meat. It's totally possible to survive like that. Pounding nothing but ground beef and bacon, not so much.
Oh also, this reminds me of my favorite bit about the guy who made Soylent.
So before he did Soylent, he worked out what the optimal food was using some nutrition-per-dollar metric he came up with himself. It was frozen microwave pizzas. He was just eating frozen microwave pizzas day in and day out, and then switched from that to his bespoke protein shake formula, and suddenly he didn't feel like absolute shit, and decided it must be that Soylent is magic, and not that literally anything is preferable to microwave pizza.