There is a keto section in my grocery store. There was not one when I started.
That is worth stopping on, because it is the fastest evidence I know that something real happened. Enough people changed how they ate, for long enough, with results good enough to keep going, that a retail category formed around them. Nobody builds an aisle for a fashion. Aisles get built for volume that has already shown up and stayed.
So let me say the first part plainly, without hedging it: cutting the refined carbohydrate worked, and it worked for a reason you can write down.
What it answered
Refined starch and sugar arrive in the bloodstream faster than anything the body spent its evolutionary history metabolizing. Milling and refining do to grain what chewing was supposed to do slowly and incompletely — they strip the structure that made digestion take time. What is left is glucose with the brakes removed. The regulatory system that handles it was tuned for a delivery rate it no longer receives, and running it constantly at the top of its range for decades is not a neutral thing to do.
Take the refined carbohydrate out and that load comes off. It comes off immediately, it comes off measurably, and for a great many people the downstream consequences come off with it.
I know this from the inside and I know it from the people who write to me. Weight gone. Pain gone. Bloodwork moved. More than one person has told me their physician cut a medication in half while watching it happen. That is a correct answer to a real question, arrived at by people who were given no help finding it, and I am not here to complicate it.
It is one question.
The questions it does not touch
Everything on this list is true of a person in ketosis and a person eating bread, because none of it is about carbohydrate.
The minerals that came out in the milling. Removing the bran and the germ removes roughly eighty percent of the magnesium with them. The 1941 enrichment standard put five things back into white flour — thiamin, riboflavin, niacin, iron, folic acid — and magnesium was not among them. The Rothamsted archive has kept wheat samples since 1843; mineral content held steady for a century and then fell from the 1960s, while the soil minerals did not. Cutting carbohydrate removes the flour. It does not put back what the flour was supposed to be carrying.
The sodium and potassium inversion. The kidney was tuned by natural selection on a diet with under a thousand milligrams of sodium a day and considerably more potassium than that. So it hoards sodium and sheds potassium, which is exactly backwards for how anyone eats now. Both inputs got inverted. Ketosis does not touch the ratio. What touches the ratio is whether your food still has its cell contents in it.
What went into the food rather than what came out of it. Under the self-affirmed GRAS pathway, a company could conclude on its own that a substance was generally recognized as safe and begin using it, with no requirement to tell the FDA it had done so. Nobody outside the company was obliged to look at the evidence. The FDA proposed ending that in August and the comment period closes on 9 December. Your macros have no opinion about any of this.
Fat composition. The ratio of fats in the modern supply is not the ratio anything was selected on, and a diet can be very low in carbohydrate while being built almost entirely from industrially extracted oils.
Four questions. Carbohydrate load is a fifth. Answering the fifth correctly is genuinely worth doing, and it leaves four standing.
And then the aisle
Here is where it turns, and the turn is not a moral story.
Once enough people were asking for low carbohydrate, the food industry did the thing it is extremely good at: it formulated a product that hit the number. Pick up anything in that section and read the ingredient panel rather than the front of the package. Soluble corn fiber. Glycerin. Sugar alcohols. Soy protein isolate. Fiber syrups with names that take a second to pronounce. Natural flavors.
That is a manufactured object, engineered to land on a macro target while staying shelf-stable and palatable. It is the same category of thing as what it replaced, built by the same industry, under the same rules, and sold to people who changed how they ate specifically to get away from manufactured objects.
And it could be built, because the specification you handed the industry was a number.
What happens to a number
Isomalto-oligosaccharide is the cleanest example I know, and it has a paper trail.
IMO is made from hydrolyzed corn or tapioca starch and it was widely used in high-fiber and low-carbohydrate bars. Counted as fiber, it gets subtracted from the carbohydrate total, which is what produces a low net-carb figure on the front of a wrapper.
In a randomized crossover trial, fifty grams of IMO and fifty grams of dextrose produced no meaningful difference in blood glucose, insulin, or breath hydrogen. Fifty grams of table sugar’s closest relative, and fifty grams of the fiber, behaved the same way in the body. Earlier work had put IMO’s digestible energy at seventy to eighty percent of sugar’s.
In 2018 the FDA declined to include IMO in its list of recognized dietary fibers and denied the manufacturer’s petition, concluding the evidence did not demonstrate a beneficial physiological effect. One of the largest bar makers reformulated after litigation over its nutrition claims. Plenty of products never did.
Note what did and did not happen. Nobody in this story committed fraud as far as I can tell. A legal ingredient was used in a legal way under a labeling term — net carbohydrate — that the FDA does not define or regulate at all. The number on the front of the package was arithmetic performed on a category the agency had not yet ruled on.
This has already happened once, at national scale
In the 1980s the country was told to cut fat. People did. They did what they were told, which is the part everyone forgets when they are being condescending about it.
The industry reformulated to hit the number. Fat came out and sugar went in, because something has to carry the palatability, and the specification said nothing about what replaced what. The low-fat cookie met the standard exactly. We spent two decades finding out what it cost.
The mechanism was not that people were weak or that anyone lied. The mechanism was that a single measurable number is trivially gameable, and the thing removed in service of the number is never part of the specification. Give the industry one target and it will hit the target. That is not a flaw in the industry. That is what the industry is for.
Low fat was the number in 1985. Whole grain was the number later, which is how we got the same product with some whole grain flour added to it. Net carbohydrate is the number now. The machinery has not changed and there is no reason to expect a different outcome from it.
What I am not saying
I am not saying the aisle is poison. I cannot demonstrate harm from any particular product in it, and I have been clear for four posts running about why that kind of harm is so hard to measure — an exposure that reaches nearly everybody leaves no unexposed group to compare against, so the study that would settle it cannot be run.
I am not running a purity test. Some packaged things are fine. A bar in a glovebox on a long drive is not a moral failure and I have eaten my share.
And I am not telling anyone who cut their carbohydrate and got their life back that they were wrong. They were right. That is the whole point of writing this down.
The test that actually survives
What I am saying is that a macro target is not a definition of food, and if it is the only specification you carry into a store, the store will meet it and keep everything else exactly as it was.
The question that holds up better is older and duller. Did this exist as a thing before somebody formulated it? Could you, in principle, point at where it came from?
That question cannot be gamed, because it is not a number. It cannot be met by substituting one ingredient for another with a better label. It takes no arithmetic and no trust in a front-of-package claim, and it happens to answer all five questions at once rather than the one.
You already did the hard part. You changed what you ate, against the advice, and you held it long enough to find out. The aisle exists because of you.
Do not let it become the reason you stopped looking.
Cutting the carbohydrate answered one question correctly. There were several — and an industry has already formulated a product for the one you answered.
There is a keto section in my grocery store. There was not one when I started.
That is worth stopping on, because it is the fastest evidence I know that something real happened. Enough people changed how they ate, for long enough, with results good enough to keep going, that a retail category formed around them. Nobody builds an aisle for a fashion. Aisles get built for volume that has already shown up and stayed.
So let me say the first part plainly, without hedging it: cutting the refined carbohydrate worked, and it worked for a reason you can write down.
What it answered
Refined starch and sugar arrive in the bloodstream faster than anything the body spent its evolutionary history metabolizing. Milling and refining do to grain what chewing was supposed to do slowly and incompletely — they strip the structure that made digestion take time. What is left is glucose with the brakes removed. The regulatory system that handles it was tuned for a delivery rate it no longer receives, and running it constantly at the top of its range for decades is not a neutral thing to do.
Take the refined carbohydrate out and that load comes off. It comes off immediately, it comes off measurably, and for a great many people the downstream consequences come off with it.
I know this from the inside and I know it from the people who write to me. Weight gone. Pain gone. Bloodwork moved. More than one person has told me their physician cut a medication in half while watching it happen. That is a correct answer to a real question, arrived at by people who were given no help finding it, and I am not here to complicate it.
It is one question.
The questions it does not touch
Everything on this list is true of a person in ketosis and a person eating bread, because none of it is about carbohydrate.
The minerals that came out in the milling. Removing the bran and the germ removes roughly eighty percent of the magnesium with them. The 1941 enrichment standard put five things back into white flour — thiamin, riboflavin, niacin, iron, folic acid — and magnesium was not among them. The Rothamsted archive has kept wheat samples since 1843; mineral content held steady for a century and then fell from the 1960s, while the soil minerals did not. Cutting carbohydrate removes the flour. It does not put back what the flour was supposed to be carrying.
The sodium and potassium inversion. The kidney was tuned by natural selection on a diet with under a thousand milligrams of sodium a day and considerably more potassium than that. So it hoards sodium and sheds potassium, which is exactly backwards for how anyone eats now. Both inputs got inverted. Ketosis does not touch the ratio. What touches the ratio is whether your food still has its cell contents in it.
What went into the food rather than what came out of it. Under the self-affirmed GRAS pathway, a company could conclude on its own that a substance was generally recognized as safe and begin using it, with no requirement to tell the FDA it had done so. Nobody outside the company was obliged to look at the evidence. The FDA proposed ending that in August and the comment period closes on 9 December. Your macros have no opinion about any of this.
Fat composition. The ratio of fats in the modern supply is not the ratio anything was selected on, and a diet can be very low in carbohydrate while being built almost entirely from industrially extracted oils.
Four questions. Carbohydrate load is a fifth. Answering the fifth correctly is genuinely worth doing, and it leaves four standing.
And then the aisle
Here is where it turns, and the turn is not a moral story.
Once enough people were asking for low carbohydrate, the food industry did the thing it is extremely good at: it formulated a product that hit the number. Pick up anything in that section and read the ingredient panel rather than the front of the package. Soluble corn fiber. Glycerin. Sugar alcohols. Soy protein isolate. Fiber syrups with names that take a second to pronounce. Natural flavors.
That is a manufactured object, engineered to land on a macro target while staying shelf-stable and palatable. It is the same category of thing as what it replaced, built by the same industry, under the same rules, and sold to people who changed how they ate specifically to get away from manufactured objects.
And it could be built, because the specification you handed the industry was a number.
What happens to a number
Isomalto-oligosaccharide is the cleanest example I know, and it has a paper trail.
IMO is made from hydrolyzed corn or tapioca starch and it was widely used in high-fiber and low-carbohydrate bars. Counted as fiber, it gets subtracted from the carbohydrate total, which is what produces a low net-carb figure on the front of a wrapper.
In a randomized crossover trial, fifty grams of IMO and fifty grams of dextrose produced no meaningful difference in blood glucose, insulin, or breath hydrogen. Fifty grams of table sugar’s closest relative, and fifty grams of the fiber, behaved the same way in the body. Earlier work had put IMO’s digestible energy at seventy to eighty percent of sugar’s.
In 2018 the FDA declined to include IMO in its list of recognized dietary fibers and denied the manufacturer’s petition, concluding the evidence did not demonstrate a beneficial physiological effect. One of the largest bar makers reformulated after litigation over its nutrition claims. Plenty of products never did.
Note what did and did not happen. Nobody in this story committed fraud as far as I can tell. A legal ingredient was used in a legal way under a labeling term — net carbohydrate — that the FDA does not define or regulate at all. The number on the front of the package was arithmetic performed on a category the agency had not yet ruled on.
This has already happened once, at national scale
In the 1980s the country was told to cut fat. People did. They did what they were told, which is the part everyone forgets when they are being condescending about it.
The industry reformulated to hit the number. Fat came out and sugar went in, because something has to carry the palatability, and the specification said nothing about what replaced what. The low-fat cookie met the standard exactly. We spent two decades finding out what it cost.
The mechanism was not that people were weak or that anyone lied. The mechanism was that a single measurable number is trivially gameable, and the thing removed in service of the number is never part of the specification. Give the industry one target and it will hit the target. That is not a flaw in the industry. That is what the industry is for.
Low fat was the number in 1985. Whole grain was the number later, which is how we got the same product with some whole grain flour added to it. Net carbohydrate is the number now. The machinery has not changed and there is no reason to expect a different outcome from it.
What I am not saying
I am not saying the aisle is poison. I cannot demonstrate harm from any particular product in it, and I have been clear for four posts running about why that kind of harm is so hard to measure — an exposure that reaches nearly everybody leaves no unexposed group to compare against, so the study that would settle it cannot be run.
I am not running a purity test. Some packaged things are fine. A bar in a glovebox on a long drive is not a moral failure and I have eaten my share.
And I am not telling anyone who cut their carbohydrate and got their life back that they were wrong. They were right. That is the whole point of writing this down.
The test that actually survives
What I am saying is that a macro target is not a definition of food, and if it is the only specification you carry into a store, the store will meet it and keep everything else exactly as it was.
The question that holds up better is older and duller. Did this exist as a thing before somebody formulated it? Could you, in principle, point at where it came from?
That question cannot be gamed, because it is not a number. It cannot be met by substituting one ingredient for another with a better label. It takes no arithmetic and no trust in a front-of-package claim, and it happens to answer all five questions at once rather than the one.
You already did the hard part. You changed what you ate, against the advice, and you held it long enough to find out. The aisle exists because of you.
Do not let it become the reason you stopped looking.