When the topic of nutrition comes up - especially for people who regularly exercise - the conversation will inevitably focus on protein. We're always being told to eat fewer carbs and more meat, fish, nuts and other sources of protein. We're encouraged to consume the nutrient before and after the gym, and are even being sold it in a variety of powders, bars and shakes for building muscle. But how much of this is actually necessary, and how much is just hearsay and health fads? When it come...