
12/01/2022
I was sick, or recovering from being sick, pretty much the entire month of November. I had zero energy for any sort of post-worthy meal preparation. It’s December now, and I’m mostly phlegm-free, so I decided to join the St. Jude’s 62 miles in December challenge. It’s been awhile since I’ve run regularly. The first time I tried to run, I ran for about 32 seconds before I gave up. But after a couple years, I got up to more than 10 miles at a time, and then settled in to running 2-4 miles a few times every week. Lately I’ve been… busy. But I’m committed to reinstating that habit. I didn’t enjoy getting up at 4:30 today. But I did it anyway. I wanted to post my treadmill stats to draw attention to the calorie burn. It means next to nothing. Not because calorie burn calculations are inaccurate on machines (which is true) but because calorie burn calculations are inaccurate in our bodies. We don’t run on calories. We run on nutrients. Just as we can’t consistently gauge how far $8.83 worth of gas with get us in our cars, we can’t accurately gauge our progress based on calories, or the “cost” of nutrition. The benefits of exercise go far beyond the calorie burn (come on… only 218 calories for nearly a half hour of consistent running?). Exercise supports mitochondrial health by placing stressors that cause them to uncouple (temporarily suspend normal energy conversion functions), which literally wastes fuel and activates mitochondrial synthesis (mitogenesis), supplying your cells with more and more energy-producing powerhouses. Exercise is also a form of hormesis (a stressor which challenges our cells just enough, but not too much, to promote health and longevity rather than damage). One way exercise accomplishes this task is through sirtuins, proteins sometimes referred to as the “guardians of the genome.” Sirtuins promote DNA repair and autophagy (the elimination of badly damaged cells) which greatly enhances our health and longevity. So next time you worry that your mechanically reported calorie burn seems disappointing compared to the effort you put in… fear not. Your cells know what you’ve done, they appreciate it, and they’ll reward you accordingly.