health experts use oversimplified analogies to predict how metabolism manages nutrition and weight.
All you have to do is burn more fuel than you take in, we were instructed, and you will reliably lose weight. Burn precisely as much as you consume and you will maintain. Burn less and you’ll gain. Simple arithmetic that doesn’t add up.
We tend to simplify what otherwise seems overwhelmingly complicated. But as we now know, our metabolic function is infinitely complex. I found myself using concepts from other scientific disciplines to help me understand and explain the human body’s inner workings.
According to chaos theory, certain systems that seem to be random in fact are not–it’s just difficult for us to perceive, at the outset, all the subtle factors that set the course and determine the outcome. One landmark of chaos theory is the “butterfly effect.” This says that even a very small, unseen occurrence in a far-off place can have a large eventual impact–that if a butterfly flaps its wings in Hong Kong, the resulting breeze can trigger a cascade of atmospheric events and cause a hurricane in Brazil.
This can be used to explain many of our bodies’ inner workings. Here’s a simple one: If you go to the gym several hours after your last meal (so that you’re on a relatively empty stomach), your body will quickly burn through whatever glycogen is in your muscles and then move on to burning fat, which is the desirable state. But if on your way to the gym you have a sports drink, one with lots of carbs, you’ll need to burn off the glucose first. And depending on your workout, you might never get around to burning fat at all. Same exact exercise routine, very different outcomes, all because of your choice of pre-exercise beverage.
Another scientific concept, the power law, also comes up often in my discussions of health and fitness. It is based on the Pareto principle, named for Italian economist Vilfredo Pareto. In essence, it describes the relationship between how common a factor is and how much influence it exerts. It says that the most unusual events will have the greatest impact. Pareto’s study determined that 80 percent of privately held land in Italy was owned by 20 percent of the population.
Similar power laws exist all around us. This relationship between low frequency and high impact is found again and again, in various fields of science, business, and elsewhere.
There is a power law of exercise, too: Your least frequent, most extreme exertions will have the greatest influence on your fitness. The peak moments of a workout count far more than the amount of time you spend working out. This is why a series of 40-yard sprints at full speed benefits you more than half an hour of jogging. It’s also the reason why lifting a weight heavy enough to make your heart pound and your muscles burn counts more than spending hours at the gym. When a work-out becomes an unvarying, monotonous routine, it loses its effectiveness.
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