Calories Should Be Divided by Ten

A banana has 105 calories.

A bowl of pasta has 600 calories.

A daily recommended intake for an adult is 2,000 calories.

These are big numbers. They sound big because they are big. You will eat approximately 730,000 calories this year. Over a lifetime, you will consume roughly 60 million calories. The numbers are absurd for a measurement that's supposed to help you make daily decisions about what to eat.

There's a simple fix. Divide everything by ten. Use a new unit. Call it whatever you want, let's say a "diet unit," or just "10 cal."

Same information. Smaller numbers. Easier to track mentally.

A banana has 10.5 units. A bowl of pasta has 60 units. Daily intake is 200 units. Your year is 73,000 units. These numbers are tractable. They live in the range your brain is actually good at.

The calorie you see on every food label is technically a kilocalorie, 1,000 of the small calories that scientists use in physics and chemistry. The unit on food labels has been misnamed since it was standardized in the early 20th century, and we've never corrected the error.

Here's the joke. The "calorie" on a nutrition label is already a factor-of-1,000 bigger than the actual unit it claims to be. We collectively decided that the real calorie was too small for everyday use, so we silently switched to a unit a thousand times larger and kept the original name. Then, having made that adjustment for usability, we proceeded to live in a world where everyday foods are measured in three-digit numbers and daily diets in four-digit numbers.

It's like measuring distance in inches when you could use feet. We did half the conversion. We should finish it.

The right scale for any common unit is one where typical daily amounts land in the 1-1,000 range, ideally in the 10-500 range.

Currency: a coffee is $5, a meal is $30, a week of groceries is $150. Easy numbers.

Distance: a walk to the store is 800 meters. Your commute is 12 kilometers. Easy.

Mass: a bag of rice is 1 kg. Your weight is 70 kg. Easy.

Calories: a snack is 200, a meal is 800, a day is 2,000. Too many zeros.

Divide by 10 and:

Snack: 20 units. Meal: 80 units. Day: 200 units. Workout burn: 30-50 units. Cookie: 5 units. Beer: 15 units.

These numbers fit in your head. You can do the arithmetic without effort. "I had 80 for breakfast, I have 120 left for the day" is faster than "I had 800 for breakfast, I have 1,200 left for the day." Less cognitive load. Better decisions. More natural.

The standard objection is that switching units is hard. Everyone is used to the current numbers. Every package, every recipe, every app, every restaurant menu is calibrated to the existing scale.

Same objection that existed for switching from imperial to metric. The countries that switched are fine. The country that didn't (the US) is still using ounces, gallons, and Fahrenheit and complaining about it constantly.

The switching cost is real. But it's a one-time cost, and the unit you end up with is better forever. Imagine if every nutrition label printed both numbers for ten years, then switched to the new unit alone. After a decade, nobody under 30 would even remember the old system. The transition would be uncomfortable. The destination would be better.

The calorie was already re-scaled by a factor of 1,000 once. We can do it again.

A small thing, but a real one.

The numbers people interact with daily would be smaller. Food labels would be easier to scan. Daily totals would be easier to track. The mental math of "should I eat this" gets simpler when the numbers involved are tens and hundreds instead of hundreds and thousands.

For people tracking calories, and there are tens of millions of them, on apps like MyFitnessPal, Noom, Carb Manager, the new unit would make the whole exercise less psychologically punishing. Counting "20" for a snack feels different from counting "200" for the same snack. The new unit lets you feel like the snack is small. The current unit makes you feel like every meal is a major event.

For policymakers, the new unit would make public health messaging clearer. "Eat 200 a day" is a cleaner target than "eat 2,000 a day." The proportions are the same. The friction is lower.

For the same reason no other unit reform happens.

The food industry doesn't want to relabel every product in the world. Regulators don't want to coordinate the change across borders. Consumers don't want to relearn the rules. The benefits accrue diffusely; the costs are concentrated on the industries that have to do the work.

It's the same reason America still uses ounces and miles. The same reason we still count years from a religious event. The same reason your keyboard is QWERTY instead of Dvorak.

The world is full of small bad standards. They persist because the alternative isn't worth the coordination cost of switching.

The calorie is too small for daily use, and we already know it, because we silently replaced the actual calorie with a 1,000x-larger unit a century ago and kept the name.

We should finish the job. Divide by ten. Live in a world where lunch is 70, not 700. Where a day is 200, not 2,000.

Small change. Real improvement. Won't happen.

But at least you can do the conversion in your head.