Meat have all vitamins. But if you plan to stay on the diet forever you should eat all parts, not just the steak.

Ah, fair enough.

I still doubt that your average person would see any real health benefits from eating only meat, even if they ate enough organ meats to actually get all their vitamins and minerals (the lack of fiber is a particular concern) but I guess you're right that there's a version of an "all meat died" that doesn't promptly kill you through malnutrition, you got me there.