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Extra protein - it all depends on what you want to do with your body, and how you want to look... if you want to keep/build muscle, then protein helps keep muscle mass....so extra protein will help.
If you want to slim down, and just run and are not worried about looking like a bodybuilder then a normal diet should be fine.
Don't forget excessive running will burn of muscle mass unless you take in enough protein... but protein shakes carry calories,, so watch out..you could end up putting on weight...