I wish I could find a source, but I clearly remember reading somewhere that Harry Nelson Pillsbury (a world-class player from the late 1800s and early 1900s) drank something like ten cups of coffee a day, and chain-smoked cigars. He knew that this was bad for him, but if he quit during a tournament, his nervous system would collapse. Obviously, that much caffeine and nicotine is not good for one's health. (Not that this has to do with anything, Pillsbury died as a result of syphilis. That probably didn't help him, either.)
As far as the original post, it is fantastic that I can say, with a clean heart, "I beat Hikaru Nakamura." As an aside, his peak rating was 2819. His 5k time is 28:11. How many people have a higher rating than their 5k time? I know that no one on earth has a higher rating than her 10k time. Maybe someone has a higher rating than their 8k time? Sub 25:00 isn't out of reach for a college runner. Maybe a GM in college also was a runner.