The Truth about Carbs
Carbs aren't the enemy
Description
Somewhere in the last twenty years, bread stopped being food and became a moral test. We started photographing our plates, apologizing for pasta, ordering the burger without the bun as though the bun were the dangerous part. Rice, potatoes, oats, fruit — a category that fed most of human history got quietly reclassified as the thing standing between us and the body we wanted. Whole aisles rebranded themselves "low-carb." Friends who couldn't tell you what a gram of protein looked like could tell you, with real conviction, that carbs make you fat.
Nate Miyaki, a nutrition coach who spent years working with physique competitors and ordinary people alike, wrote The Truth about Carbs to take the temperature down. His argument isn't a defense of doughnuts. It's more irritating than that, because it refuses the fight we've set up. Carbs aren't the enemy, he says — but they aren't a free pass either. The macronutrient we've turned into a hero or a villain is mostly just a tool, and the interesting question was never "good or bad." It was "how much, of what kind, for whom, and when."
That shift sounds modest until we notice how much of the diet industry depends on us not asking it. A single banned ingredient is easy to sell. A body that needs different fuel depending on how it's used is harder. Miyaki's book sits in that harder place, and it's worth following him there — because the way we've argued about carbs says something about how we've stopped trusting ourselves to eat.
The question we’re asking : If carbs aren't the enemy, why have we spent two decades treating them like one — and what's the honest answer to how many we should eat?What we’ll see : How a whole food group became a scapegoat, what carbohydrates really do in the body, why the right amount depends entirely on the person, and what it takes to eat without a rulebook.
Table of contents
01Chapter 1 — The scapegoat we invented
The carb panic didn't come from nowhere. Miyaki traces it back to a genuine problem badly diagnosed. By the late twentieth century, people were getting heavier, and the low-fat advice of the 1980s and 1990s had plainly failed — partly because stripping fat out of food meant loading it with sugar to make it taste like anything. When fat lost its status as the dietary villain, carbohydrates were next in line. The low-carb movement rushed into the vacuum with a simple, sellable story: insulin makes you store fat, carbs spike insulin, so carbs make you fat.
The story wasn't invented out of thin air. Refined carbohydrates — the white flour, added sugars, and processed snacks engineered to be eaten by the handful — really are a problem when they crowd out everything else. But Miyaki's point is that a real culprit got generalized into a whole innocent category. The soda and the sweet potato went into the same box marked "carbs," and the box got thrown out. That's the sleight of hand at the heart of the panic: taking the genuine damage done by ultra-processed junk and pinning it on rice, oats, beans, and fruit.
02Chapter 2 — What a carbohydrate actually does
Strip away the marketing and a carbohydrate is just a molecule the body is very good at turning into fuel. Miyaki walks through what actually happens: most carbs break down into glucose, which the body burns for energy or stores as glycogen in the muscles and liver for later. This is not a malfunction. It's the system working. Muscles running hard — sprinting, lifting, playing — draw on that glycogen, and topping it back up is a large part of what carbs are for. The brain, too, runs comfortably on glucose. Calling the body's preferred quick fuel "toxic" was always a strange move.
The confusion, he says, comes from lumping wildly different foods together. A doughnut and a bowl of lentils are both carbohydrates in the way a firecracker and a campfire are both fire. Refined carbs arrive stripped of fiber, digest fast, and spike blood sugar sharply — which, eaten constantly and in excess, is a real metabolic problem. Whole-food carbs come wrapped in fiber, water, and nutrients that slow digestion, blunt the spike, and leave us full. Fiber in particular does work no supplement replicates: it feeds gut bacteria, steadies blood sugar, and makes a meal satisfying enough that we stop eating.
03Chapter 3 — Nobody eats the same way
Here is where Miyaki parts ways with almost every diet book on the shelf. There is no universal carb number, he insists, because there is no universal person. The right intake depends on who is eating, how they're built, and what they're doing with their body. A lean athlete training hard six days a week and a sedentary office worker trying to lose twenty pounds are not the same machine, and feeding them the same plate is how one-size advice fails everyone at once.
Activity is the biggest lever. Someone who empties their glycogen stores in hard training has an obvious place to put carbohydrates — the body is asking for them, and they refuel performance without much risk of surplus. Someone sitting most of the day, burning less, has less room. Miyaki's rough logic is to scale carbs to how much they're being used: more movement, more carbs; less movement, fewer, with protein and vegetables holding the line. Body composition matters too — a leaner, more active person tolerates carbohydrate far better than someone carrying excess weight and insulin resistance.
04Chapter 4 — Eating like an adult again
Step back from carbohydrates for a moment and the carb wars start to look like a symptom of something larger. We've spent decades handing our eating over to whatever single villain the culture nominated — fat, then sugar, then gluten, then carbs, now sometimes seed oils. Each panic follows the same shape: find one ingredient, declare it the cause of everything, sell the solution. Miyaki's quiet rebellion is against the whole format. The truth about carbs turns out to be that there is no truth about carbs in the abstract, only a truth about a particular person eating a particular amount.
That's a harder message to package, which is exactly why it keeps losing to simpler ones. A rule you can print on a label — eliminate this, and you're safe — asks nothing of you except obedience. Calibrating food to your own body asks you to pay attention: to notice how you feel, how you're training, how much you're actually eating, when the cravings hit and why. It replaces a commandment with a skill. Skills are slower to learn and impossible to sell in a thirty-day challenge, but they're the only thing that survives past the challenge's end.
05Conclusion
So we come back to the plate with the bun set aside, the pasta half-apologized for, the fruit eyed with suspicion. Miyaki's answer to all of it is deflating in the best way: mostly, relax. Refined junk eaten endlessly is a problem worth taking seriously. Rice, oats, beans, potatoes, and fruit, eaten in amounts that match how you live, are not. The macronutrient we cast as a villain was doing an ordinary job all along — fueling the body, feeding the brain, keeping us full — and the drama was ours, not the food's.