The second theory is similar and is known as "evolutionary neuroandrogenic (ENA) theory of male aggression".   Testosterone and other androgens have evolved to masculinize a brain in order to be competitive even to the point of risking harm to the person and others. By doing so, individuals with masculinized brains as a result of pre-natal and adult life testosterone and androgens enhance their resource acquiring abilities in order to survive, attract and copulate with mates as much as possible.  The masculinization of the brain is not just mediated by testosterone levels at the adult stage, but also testosterone exposure in the womb as a fetus. Higher pre-natal testosterone indicated by a low digit ratio as well as adult testosterone levels increased risk of fouls or aggression among male players in a soccer game.  Studies have also found higher pre-natal testosterone or lower digit ratio to be correlated with higher aggression in males.     
I am at that point now too. I bought Pure Protein from 's about $20 for a big container of it. Each scoop is only 140 calories, 3 grams of carbs and 25 grams of protein. They have Chocolate and Vanilla flavors. The best way I have found to fix it is to put 8 oz of super skim milk in a blender, put in 1 scoop of the powder. Mix that up for about 30 second then put a couple of hands full of ice in and blend it up till all the ice is crushed up. It makes a 22 or 24 oz cup of shake that is really thick, filling and it's got a slightly sweet taste too that helps with sugar cravings.
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