Your body won't process excess protein, it may store it by converting it to a storable fuel. However, steaks (beef) are probably the best natural source of protein, besides eggs. They contain a lot of fat though and that add calories, so it is nice to balance those calories from a steak (1100-2000 kcal) for some of them. When you eat steak you are eating muscle, specifically red (slow twitch) muscle and that also gives you iron, creatine (naturally source), and some of the vitamins needed for muscular function.
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