6 cans of beer = 886 calories
12 cans ~ 1700 calories
aside from the obvious empty calorie surplus, yes, alcohol stunts testosterone production, stunts muscle growth and repair, stunts your immune system...
Frankly if you're drinking a half a case of beer a day, you have a problem and need help. That's not normal, casual beer drinking...its a chemical dependancy that's ruining your liver and general health.