It's as simple as that. We're hardwired to eat what we need to a certain extent. Everyone likes sugar because it's cheap, easy energy. However, historically (and by that I mean the millions of years of our evolutionary development and all the way to the not-so-distant past of the past century for many cultures) men are the hunters, the protectors and the warriors. Men's bodies are built for strength. Strength requires developed muscles. Meat provides the protein needed to grow and maintain those muscles.

I've been working out every day for a while now and my muscles are sore every day. I have noticed that my craving for meat has spiked (of course, so has my energy level).