The average person needs about 800,000 calories per year. And it takes about 3,500 extra calories to gain a pound of weight. So if somebody stays about the same weight for a year, it means they fulfilled their 800,000 calorie requirement to within a tolerance of 3,500 calories, ie they were able to match their food intake to their caloric needs with 99.5% accuracy.
By this measure, even people who gain five or ten pounds a year are doing remarkably well, falling short of perfection by only a few percent. It’s not quite true that someone who gains five pounds is ((5*3,500)/800,000) = 98% accurate, because each pound you gain increases caloric requirements in a negative feedback loop, but it’s somewhere along those lines.
Take a second to think about that. Can you, armed with your FitBit and nutritional labeling information, accurately calculate how many calories you burn in a given day, and decide what amount of food you need to eat to compensate for it, within 10%? I think even the most obsessive personal trainer would consider that a tall order. But even the worst overeaters are subconsciously managing that all the time. However many double bacon cheeseburgers they appear to be eating in a single sitting, over the long term their body is going to do some kind of magic to get them to within a few percent of the calorie intake they need.
It’s not surprising that people overeat, it’s surprising that people don’t overeat much more. Consider someone who just has bad impulse control and so eats whatever they see – wouldn’t we expect them to deviate from ideal calorie input by more than a few percent, given that this person probably has no idea what their ideal input even is and maybe has never heard of calories?
Scott Alexander, “Book Review: The Hungry Brain”, Slate Star Codex, 2017-04-27.
June 21, 2019
QotD: Caloric intake and weight gain
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