I am in no way a sports guy, so for me to link to an article from ESPN must be an indication that there is something interesting going o. And, indeed, there is…

At 5-foot-6, Caruana has a lean frame, his legs angular and toned. He also has a packed schedule for the day: a 5-mile run, an hour of tennis, half an hour of basketball and at least an hour of swimming.

As he’s jogging, it’s easy to mistake him for a soccer player. But he is not. This body he has put together is not an accident. Caruana is, in fact, an American grandmaster in chess, the No. 2 player in the world. His training partner, Chirila? A Romanian grandmaster. And they’re doing it all to prepare for the physical demands of … chess? Yes, chess.

The TL;DR version is this: even though chess is the least apparently physically taxing sport since competitive napping, the studies show that the stress, mental load, and related stresses cause your body to lose weight the same as if you were engaged in heavy sports.

What this means for survivalists is that the people who stress about long-term food being loaded with fat, salt, and calories that you don’t need when all you’re doing is sitting in a fallout shelter waiting for the rads to go down are missing a point. And in a crisis, the severe stress and mental taxation that you will be subject to will take a toll on yourbody even if you’re just sitting around a battery radio in the dark as the city crumbles around you.

Read the article and substitute ‘chess’ for ‘disasters’ and you’ll see how this affects you and I.

Grandmasterssurvivalists in competitiondisasters are subjected to a constant torrent of mental stress. That stress, in turn, causes their heart rates to increase, which, in turn, forces their bodies to produce more energy to, in turn, produce more oxygen. It is, according to Marcus Raichle, a neurologist at Washington University in St. Louis, and Philip Cryer, a metabolism expert at the school, a vicious, destructive cycle.

Meanwhile, playerssurvivalists also eat less during tournamentsdisasters , simply because they don’t have the time or the appetite. “The simple explanation is when they’re thinking about chess disasters, they’re not thinking about food,” says Ewan C. McNay, assistant professor of psychology in the behavioral neuroscience program at the University of Albany.

Stress also leads to altered — and disturbed — sleep patterns, which in turn cause more fatigue — and can lead to more weight loss. A brain operating on less sleep, even by just one hour, Kasimdzhanov notes, requires more energy to stay awake during the chess game. Some grandmasterssurvivalists report dreaming about chessdisasters, agonizing over what they could have done differently for hours in their sleep, and waking up exhausted.

Sound familiar?

Continue reading the article and read what these people do to maintain mental acuity under these conditions of heightened stress. Big exam coming up? Strategy session with your department chairs? Making long-range plans for your familys survival? You’ll need your brain in peak performance so you might want to read what these guys do to their diets, exercise patterns, the way they breathe, and even the way they sit in order to maximize brainpower for “the ultimate test of cerebral fitness.”

I’ve noticed that when I need stone-cold clear-headed maximum-brainpower I get best results if I exercise to get the blood flowing and don’t eat for several hours beforehand. The ability to think clearly and efficiently is probably the most useful talent for someone who plans on making their way through the crapstorm that life tends to hurl at us once in a while. Optimizing your body to allow you to ‘think better’ may be one of the better tricks you can have up your sleeve.