Screw the "legal" drinking age, most other civilized countries let teenagers drink, as they should. Next you're gonna tell me teenagers should be branded as rapists for having sex with other teenagers...oh wait.
There's something bizarrely puritanical about the OP, and what's with wanting to connect Mark Sisson to teenage drinking? As if the typical crossfit nutritional quackery and fearmongering weren't enough, there you go just being a crazy asshole with some very fishy motives.
Knowledge: The truth about alcohol, fat loss and muscle growth | Intermittent fasting diet for fat loss, muscle gain and health
“The whole concept of a macronutrient, like that of a calorie, is determining our language game in such a way that the conversation is not making sense." - Dr. Kurt Harris