As X has pointed out before, if you really get in to it, it becomes a lifestyle. I dont push it as far as bodybuilders do with their diets, but i try to be strict on a couple of things. For me powerlifting has done quite alot for me. It gave me something to be physically competitive in, to advance and improve in. To give a ton of strenght and confidence, and when free from injuries (fuck 2013, seriously), that enables me to have a bodytype i liked (i was 1.2 years the body you had before your strong diet).
I can put goal and make them, dream of future goals and plans.
At the same time i'm a biochemist, with endless respect for the incredible organ that is our liver.
As a gratitude for what a liver can metabolise and create, and what powerlifting could offer me, i gave up on alcohol.
As a result, in 2009 i could bench 35kg, squat my own weight for 8 reps and laterall pulldown 30kg. I couldnt do push ups. Giving up alcohol is an incredible factor in the recovery. 5 Years later in absolute strenght i scaled past everyone i ever trained with, and i recover better as a natural, then pretty much every juicer in my current gym.
The guy who beat me on points at the meet in april, likes to drink alot in weekends and sometimes during the weeks. He needed 2 weeks deload after the contest. I was allready squatting 5vers on 160 the day after the meet. I'm currently doing his maximum squat for 3 reps with good form and 2 grinded ones in the tank, whilst having lost another 8 kg since.
Each and every day, i'm feeling the difference because i dont consume alcohol or chocolate. And thats my incentive, to not touch it.