A new asteroid was recently spotted, containing millions of tons of gold and precious metals. At current prices, those could be worth many trillions of dollars.

Exciting. Imagine if we could get it. We would all be rich!

That’s how we see gold today—scarce, precious, life-changing. Just a single bar of it could change your life.

But the reality is, if we were able to bring that asteroid home, it wouldn’t be that valuable. With trillions of extra tons, gold would no longer be rare or valuable. Suddenly, lugging around a heavy, soft, shiny metal would be a hassle, not a blessing.

Its value would vanish overnight. This has happened before—in the past we used to highly value rare things like salt, or tea. Companies made billions of dollars sailing around the world to procure these rare items. Now you can get them at any corner store for less than a dollar,

For almost all of human history, calories were very rare, like gold or bitcoin. You wanted as much as you could get.

But now we have flipped that equation. They have gone from rare, to having too much. Instead of trying to burn less calories, like we did for millions of years, now everyone wants to burn more.

Every cell in your body still remembers: grab calories when you find them, because famine is always around the corner.

That’s why, when someone sets a 1000-calorie cake in front of you, your instincts don’t hesitate.

Your brain says “yes!”—just like you’d snatch up a gold bar if someone handed it to you. Those instincts once meant survival.

So as we start to look at these calorie equations and track where the actual energy goes, keep this in mind. If something seems strange or backwards, it is because we are now trying to do the literal opposite of the original goal: spend a lot instead of saving.

Why do we need food tracking, smart devices, or an AI coach? Why can’t we just listen to our bodies, eat when we’re hungry, and stop when we’re full?

The human body can and does work really well, but only in the right conditions. We can sleep well, for example, when there are no lights and the temperature good and it is similar to what “nighttime” looked like 1000 or 5000 years ago. But if there are bright blue lights and it is hot and sirens are going in the background and you’re on your phone, probably not so much.

Unfortunately, our bodies weren’t built for this world.

The first and most urgent problem for most people is weight loss.

And to do this, requires really understanding calories: a heated subject that is currently misunderstood by almost everyone.

What Is a Calorie, anyways?

Let’s take a step back: what is a calorie, anyway? In the simplest scientific sense, a calorie is just a unit of energy—specifically, the amount of energy needed to raise the temperature of one gram of water by one degree Celsius. That’s it. No magic, no mystery. Think of a calorie like a dollar: it doesn’t care where it comes from or how you spend it.

It’s just a way to keep track of energy moving in and out. Just a unit of measurement.

Just like in economics, where what really matters is how dollars flow, where they go, and all the hidden taxes and fees, calories in the human body aren’t as simple as basic arithmetic.

Now we are able to trace all the energy through your systems, and better understand where it is going.

Most people, and even most apps, use very simple math: Total Calories = Basal Metabolic Rate (BMR) + Exercise. But that’s like a physics problem where friction, air resistance, and real-world messiness are ignored. In reality, your body’s calorie math is more complex.

And that’s the real topic of this essay: how calorie math works in the real world, why so many people get stuck or confused, and what you can actually do about it.

Calories Aren’t Always What They Seem

Think about the last time you bought something for “99 cents,” only to be surprised at checkout when the total rang up higher. Taxes, hidden fees, and other charges sneak in—annoying, but just part of life. And an experienced store-goer starts to understand how much things actually cost.

Calories work the same way. That snack bar might say “110 calories” on the label, but the true number your body absorbs can vary. There are lots of variables that can affect the true outcome. That doesn’t mean prices aren’t real, or calories don’t matter, or that numbers can’t be used, but just that we need more precise tools and understanding to be able to use them correctly.

All these complex rules may be a lot to track perfectly in your head. The average person can’t be expected to manually account for every detail and do all the math. That’s where algorithms and AI shine—they can spot patterns, add up hundreds of numbers, and find signal in a lot of noise.

A realistic budget

Imagine you make $2,000 dollars a month. You do some quick math—that is about $66.66 a day.

So every day you go spend $30-50 on things like food. But even before the end of the month, you realize you ran out of money. What went wrong?

The plan seemed scientific, but basic things were just not counted, like rent or taxes. So even though it seemed like good math, the whole premise was wrong. If you are able to take all these variables into account, then a more correct budget can be made. Or more padding is needed.

Even with money, where we have clear numbers, prices on things, and online banking, it is easy to lose track of a budget or for things to add up unexpectedly. Have you ever had a trip to Whole Foods to buy a few things, and then the total is over $100, and you have no idea how that happened?

The common problem

Let’s say you estimate your TDEE using an online calculator. It tells you 2,400 calories per day. You aim to eat 2,000, expecting fat loss. A month later—nothing.

First of all, if not using Gyroscope it is possible the calories tracked were wrong. Many calorie apps can be off by over 50% unless you weigh each item. Or if they are hard to use, many items may just not get logged.

However, another possibility is your actual energy expenditure may be far lower than estimated. This is often due to sleep deprivation, low NEAT, hormonal suppression, or even subtle medication effects. Or your intake may be off due to under-logging, rounding errors, or uncounted snacks. These are not minor variables—they can easily swing daily intake or output by 300–800 calories, the difference between success and failure.

That’s why accurate food logging and objective weight trends matter. Once you are tracking in Gyroscope, you can see where the calories are going. It isn’t just exercise.

Where do your calories actually go?

With our calorie usage and balancing our input and output, the situation is even harder.

There are many ways your calories are used. Even digesting the food you eat uses calories (the thermic effect of food). Exercise counts too, but is not as much as many people imagine.

Why are so many people stuck, or even gaining weight despite “doing everything right”?

Why is more than half of the US population overweight or obese?

Modern life is a perfect storm of negative feedback loops.

One bad night of sleep raises stress hormones, which make you hungrier for junk food, which spikes your blood sugar, which wrecks your sleep…and the cycle repeats. Over years, this loop can tip many people toward obesity.

It’s not just about seed oils or mysterious chemicals—though ultra-processed foods certainly don’t help. It’s about a system that’s been pushed way out of balance. At that point, simply walking a little more or eating a little less won’t be enough to balance it, and bigger changes are needed on both sides.

At Gyroscope, we believe that tracking correctly is the first step.

Most people just have no idea what is going on inside our bodies, or how many calories they’ve actually eaten. Most other apps are off by almost 50% according to studies, even for people who did try tracking.

So how can we be expected to competently manage it and make decisions? Both better tools and better strategies are needed.

So today let’s look at what actually happens. Where does all that energy go? Onde we understand all the components, how can we set in place a better budget?

Your body is an expert accountant, constantly tracking energy coming in (food) versus energy going out (movement, heat, repair, even thinking).

This is the classic “calories in, calories out” model—but, like all models, it’s a simplification.

Within the buckets of in and out are lots of items and variables to account for. Without properly tracking and measuring them, the whole system fails. This is where most people go wrong.

The most common misunderstanding about energy?

Many people think extra exercise just increases the daily calorie burn (your Total Daily Energy Expenditure, or TDEE). Badly designed apps perpetuate this misunderstanding. It is a very simplistic model, that is basically not true. That your total energy usage = your BMR plus your exercise. It is really easy to code, so some apps added this years ago, but it is really not how things work.

TDEE: Not as Variable as You Think

Studies show your TDEE (total daily energy expenditure) is surprisingly stable, like a monthly salary rather than an hourly wage.

It does change, but gradually and on the course of weeks or months, not within a few hours.

So if you just started exercising right now and burn “100 calories” according to your watch, your body doesn’t say “oh cool, let’s burn 100 more calories today since you are being active” — it is more of “Oh, how do we rebalance this to stay at the same calories we had yesterday?”

It is tempting to just look at the calorie number from your wearable after a workout and tack that on. 300 calories from the run? “Cool, now I can have an extra 200 calorie cookie and still break even.” Even we made this mistake in the early versions of Gyroscope, but unfortunately the accounting doesn’t really work like that.

In the short term, if you exercise more, your body can easily compensate by burning less elsewhere—maybe you fidget less, or your body subtly dials down its repair processes.

It is kind of like spending an extra $100 on some unexpected expense. With a good budget at least (and the human body is very good at budgeting or staying conservative), you could cut back on some other things to compensate and not spend much more in the month.

NEAT is the biggest sort of “slush fund” for calories, so if you needed a few hundred extra calories, just simply cutting spending there would be easy. That is similar to a family spending money on going to the theater, buying movie tickets and popcorn. Maybe that is usually a monthly tradition, but if money was tight that would be an obvious thing to skip — before skipping out on more essential things like groceries or rent. Similarly, your body has hundreds of calories budgeted for fidgeting around or walking or tapping your foot nervously, that are easy to cut back on if needed.

A randomly added exercise session doesn’t simply “add” to your day’s burn rate, it’s generally part of a fixed energy pie that was already calculated and planned for that week. This is why just adding exercise on January 1 rarely leads to dramatic weight loss.

But it’s not all hopeless. The takeaway here isn’t that your TDEE was decided once and is fixed forever. It can and does change. But the magnitude is maybe less than you may expect. It changes more gradually, and from other factors rather than exercise.

People literally get this backwards—they think going running will increase their TDEE, but don’t think that sleeping better or avoiding alcohol will increase it.

In reality, living a “healthy” lifestyle can really increase your calorie usage over time. It isn’t dramatic—just sleeping better doesn’t mean you can eat 1,000 calories more every day. But every bit can start to add up.

If instead of just hitting the gym once or twice, it is a daily habit, your energy expenditure for exercise and NEAT may be more like an athletes, at thousands of calories rather than a few hundred. Or if you walk 20,000 steps a day as part of your lifestyle, then your calorie numbers will end up quite different and higher.

Together, sleep quality, stress, hormone levels, even the temperature of your environment can swing your TDEE by hundreds of calories.

This can be used to your advantage—to boost your energy usage, and signal to your body that everything is ok and that it is safe to spend a lot—or to your detriment: in a state of panic and high stress your body can and will try to cut down its spending to help out, actually reducing your daily calories out.

A thousand years ago, reducing your calorie usage would’ve been useful, but now that actually causes more problems. But your individual cells or organs like your liver don’t know about that or aren’t able to read the latest Gyroscope essays—they’re just doing what they were programmed to millions of years ago.

Most online calorie calculators just look at height and weight, which is a very rough guess. However, it is very easy for that number to be quite wrong or unrelated to your actual amount.

That’s why a sleep-deprived, stressed-out office worker might need 2000 calories a day, while a well-rested, active person in a cold climate could easily burn 3000. Or even the same person may vary as their health changes. How do you know where you lie?

Calories are Like Money: It’s About the Budget

Think of calories like money. Saving is good, but if you never earn any, you’re in trouble.

Likewise, you can’t out-exercise a bad diet, but you can’t just slash calories forever, either.

Managing both side efficiently gives you the best bang for your buck, and best chance of your success. You don’t need to be super-ambitious on either side.

You don’t need to go to the gym 2 hours a day to get your energy expenditure up to elite-athlete levels. Nor do you need to diet extremely down to less than 1,000 calories a day.

Instead, you can just do a pretty good job on both sides. Sleeping well and living a pretty active lifestyle. Not depriving yourself of meals, but also not going way over your calorie budget on any single day.

In reality, these aren’t just two big numbers, but hundreds of variables to consider and fit together. Not just one food choice, but hundreds of meal decisions and habits on the calorie-in side of the equation.

The Gold Standard: Tracking Your Weight

With all these variables in play, how do we know if we’re actually making progress? Actually in a calorie deficit, rather than following wrong calculations?

The good news is Earth gravity is remarkably consistent. While we lack the science or technology to measure every molecule in our bodies or all our hormone levels, we can easily and affordably track our weight.

In the old days, before online banking, people had to “balance a checkbook” — so you had a paper log of your recent transactions, and then occasionally you would check your actual bank balance to see if it matches. If not, something was missing. Kind of silly and unnecessary now with instant digital banking, but for our bodies we still need to rely on these methods.

Here’s where we get back to basics: the most reliable, practical way to see if the equation is balancing is by tracking your weight over time. For an average person the biggest change (once the random fluctuations are smoothed out) will be from bodyfat, not muscle.

Now the latest app compares your daily calorie intake with your weight trend over weeks and months, to more precisely understand your actual calorie usage. Not just from statistical calculations of people of your age, weight and height, but your actual usage.

Are you moving up, down, or staying stable? That can then be used to adjust your eating, knowing if you should be eating more, less, the same, or different foods.

Stop guessing and start knowing?

With the right tools, tracking, and a bit of scientific insight, you can finally take control of your health—even in a world where extra calories and junk food are everywhere.

Want to see your true numbers and start optimizing your own “calorie budget”?

Start tracking your food in the app today.

Now it is as easy as taking a photo and weighing yourself. Anyone can do it.