I think this is good advice. I know we pride ourselves on achieving near peak performance in this forum, it is still good to have a few beers or some junk food every so often, for the sake of sanity if nothing else.
Bingo.
Sanity and balance. Key. How many people have you known who have gone through an extended period of EXTREME discipline and deprivation, only to completely
"cut loose" after that period ended, resulting in some dire consequences. BALANCE IS KEY. Not just in diet and exercise, but in all things.
I had a friend in college whose parents thought he was not making an effort in his studies. To be fair, he was coasting a bit, with a 2.5 GPA and he was certainly living the decadent college lifestyle. His very rich parents decided to bribe him with a pimping Ducati superbike if he got a 4.0 for his sophmore year. He became obsessed. He gave up everything to get this bike. Half way through the year, he was on track, so to up the anti, his parents bought the bike over Christmas, and had it in the garage so he could see it. If he did not get the 4.0, the parents were going to sell it. He was even more motivated. I do not even think i saw him outside the library that whole second semester. But you know what, he got his 4.0 and he got his bike. We were in a wrestling mini camp immediately after the year ended, so his parents brought the bike up as a suprise for him.
He was over the moon. After his parents bought us dinner and headed home, he took the bike to show it off to everyone. Then he had a few drinks. Then he had a few more. Then he said he was going to the bathroom. After he did not come back for 20 minutes, I went to look for him. By now you know the end of the story. He took off on his bike and lost control at about 120 mph. He was "lucky" to be alive, though he spent several weeks in the hospital, a number more in traction, and still more in physical therapy.
I know this only loosly related to the posters question about alcohol. And I am certainly not saying someone needs to have the occasional drink to have balance in their life. All i am saying this that the tighter something is packed, the bigger the mess when it pops.