Exercise Releases Brain-Healthy Protein

This can happen for a variety of reasons: poverty, nutrition, "misaligned" interests, etc.

Intelligence plays a role in that someone with an IQ of 80 probably isn't going to Stanford, but there are ostensibly plenty of people with IQs far above your average Stanford student who will never set foot in a university.

Everyone can exercise, no matter what condition: bad heart, missing lung, missing limbs, etc. There is some form of exercise that can be done. You name a condition, I'm sure I can find someone on youtube with that condition absolutely crushing a work out.

Your question assumes that bodily health and brain health are separate and distinct things - as if we are mental beings that just happen to have bodies.

Perhaps we should read the headline as "exercise releases body healthy protein" ... I doubt we'd consider that an evolutionary paradox.

Probably these results should be considered ipso facto.

Spark details how high-intensity cardio (like sprints or interval training) put your brain chemicals in balance in part by generating BDNF (http://en.wikipedia.org/wiki/Brain-derived_neurotrophic_fact...), which as Ratey describes, it's like "Miracle-gro" for the brain.

Last year my stress levels were getting out of control from working too much. At the time I was running at least two miles every day so it's not like I wasn't exercising. But then one day I changed from running a couple miles to running 50-yard sprints, as fast and as hard as I could push myself. The first day I only ran four sprints, but I felt euphoric the rest of the day -- the best I had felt in years. So I tried it again a couple days later, and sure enough it worked again -- I felt amazing.

So then I had to find out why this worked -- why a few sprints were so much more effective than running several miles. I started Googling and eventually found Ratey's book -- it explains the entire biochemical process of what's going on and why sprinting works.

It's an eye-opening read. Each chapter covers how high-intensity cardio affects things like stress, anxiety, depression, ADHD. I have ADHD but haven't taken anything for it in years (since I was in college), and I can attest that sprints not only fixed by stress levels, but my ADHD symptoms were almost non existent.

Here's a key point that Ratey makes throughout the book that completely changed my perspective on things -- he says that instead of thinking of exercise as something you should do to look good and build a healthy body, you should instead think of exercise as the key to building a healthy brain:

"We all know that exercise makes us feel better, but most of us have no idea why. We assume its because we're burning off stress or reducing muscle tension or boosting endorphins, and we leave it at that. But the real reason we feel so good when we get our blood pumping is that it makes the brain function at its best" (http://www.sparkinglife.org).

In the book's introduction he goes on to say, "Building muscles and conditioning the heart and lungs are essentially side effects. I often tell my patients that the point of exercise is to build and condition the brain."

In fact the brain exercise routine he recommends is similar to a weight workout routine, in that you have to push yourself hard one day, and then take a day off to let your brain recover, just like in weight training. Another key is when you sprint, always put everything you have into it. Run as fast and as hard as you can so you are constantly pushing your body and your brain past their limitations -- this is the key to growth.

Reposted from: http://news.ycombinator.com/item?id=5323019 (2013)

Also see: "How exercise boosts brain health" (http://www.kurzweilai.net/how-exercise-boosts-brain-health)

> The fact is that none of this greatly influences reproductive fitness, so it is unlikely to be acted on by evolution.

It absolutely does, in fact, it's probably a key influence of reproductive fitness in predatory species. The species that can gather more energy or more efficiently use that energy is going to out-grow their peers more each successive generation. And it's easy to see the relationship between more efficient learning and gathering more food.

A group of hunting animals that learn 10% faster during and after exercising than a control group would have a huge resource advantage because they increases both the pool of available prey and the likelihood of catching prey. Acquiring just 7% more calories (and translating that into 7% more offspring) would result in a population that is double the control group in 10 generations.