The bunless burgers insulin response is lower than the same burger with bread because the bun was the only fast-digesting carbohydrate on the plate. Take it off and the meal becomes fat and protein, which is a different metabolic instruction than fat, protein and refined flour arriving together. That is the whole point of the swap in the 600-burger experiment, and it is about the bread, not the beef. Individual results vary, and nothing here is a promise about your own panel.
What did taking the bun off actually change about the burgers?
It removed the only fast carbohydrate in the meal. That is it. A burger without a bun is fat and protein and a little salt; a burger with a bun is fat and protein and refined flour, and those two meals do not land in the body the same way. The bunless burgers insulin response question is really a question about flour, because the patty barely moved when we changed everything else around it.
Picture the tray. Two patties. Cheese. A knife and fork instead of hands. No paper sleeve, no sesame seeds, no ketchup cup. For 600 burgers across 30 days that was the picture, and the strangest thing about it was how quickly it stopped feeling strange.
Here is the real problem with how most people describe this. They say we “ate burgers,” as if the bun were a wrapper and not an ingredient. The bun is an ingredient. It is the ingredient that decides what the rest of the meal does, and if you want the full definition of what we were actually eating, I laid it out in what the keto diet actually is and what the film tested.
Was the bun really a control variable in the experiment?
The honest answer is no, not in the way a laboratory would mean it. We did not run a crossover trial where the same man ate the same patty with bread one week and without it the next, with blood draws on a schedule. The bun was a constant we removed at the start, not a switch we flipped back and forth for the camera.
Let me rephrase the previous sentence, because it matters more than it sounds. In a real kitchen, over 30 days, with a physician eating the food and a filmmaker weighing everything, you get one long natural experiment and a stack of before-and-after numbers. You do not get a clean isolated variable. Anyone who tells you their documentary isolated a single variable is doing marketing and calling it science.
So what can I say? That the bun was the first thing to go, that it never came back, and that Dr. Mike’s panel at the end of it did not look like the panel of a man who had eaten thirty days of fast food. The figures from those draws are in what happened to Dr. Mike’s blood, where they belong, with the caveats attached.
Why does the bunless burgers insulin response differ from the same burger with bread?
Because white bread is one of the biggest insulin signals in the food supply, and beef is not. That is not a slogan. It is what happens when somebody measures it.
In a 1997 study published in the American Journal of Clinical Nutrition, researchers fed 38 foods in equal-energy 1000-kJ portions to groups of 11 to 13 healthy subjects and took finger-prick samples every 15 minutes over 120 minutes, scoring each food against white bread as the reference at 100. White bread consistently produced one of the highest glucose and insulin responses of everything tested, and the spread between the top and bottom of the list was eightfold, from jellybeans at 160 to peanuts at 20. Sit with that for a moment. The reference food for insulin demand in nutrition science is the thing we wrap our lunch in.
The part most keto articles leave out
Beef is not insulin-free, and I am not going to pretend otherwise. The same researchers reported that protein-rich foods and bakery products both produced insulin responses that were disproportionately higher than their glycemic responses — beef, cheese, eggs and fish among them. Protein calls for insulin without dumping much glucose into you, which is a very different transaction from flour, and the meal-order work makes the same point from the other side: eating the carbohydrate last lowered postprandial glucose and insulin excursions in people with type 2 diabetes. Order it last. Or do not order it.
Does a burger without a bun actually keep you full longer?
It did for us, and the food data says that is not imagination. Bread is the floor for fullness, not the ceiling.
The same research group built a satiety index in 1995 by feeding equal-energy servings of 38 foods and scoring the satiety response of each against white bread, set at 100. Read that scale again. Bakery products as a category averaged below the white bread baseline for satiety, which is a polite way of saying the bun is close to the least filling thing per calorie you can put next to a slab of beef.
What happened in my own kitchen was duller than that and more convincing. Two patties and I was done. No four o’clock hunt through the pantry, no second dinner. Nobody sat there admiring my discipline, because there was no discipline involved — the food simply stopped being interesting once I had eaten enough of it, which is the whole trick and the reason I keep saying boring is good. I collected the habits that survived all of it in the eating tips that outlasted the 600 burgers.
Isn't this really about the processed meat and not the bread?
No. This one is about the bread, and I have already spent a whole piece on the meat. If you came here looking for the additive scare, read the truth about pink slime and lean finely textured beef instead, because that argument and this one are separate arguments and blending them helps nobody.
Here is the test. If the meat were the problem, removing the bun would have changed nothing, because the patty never left the plate. The patty stayed. The processing stayed. The salt stayed. The only thing that left was the flour, and that is precisely why the swap is interesting: the variable we removed is the one the insulin data keeps pointing at, while the ingredient everyone panics about stayed put for 30 days.
That is not hyperbole and it is not a defence of fast food. It is a narrower claim. A processed patty inside refined bread is a different meal from a processed patty on its own, and the difference is not moral, it is biochemical. If you want the broader frame — carbohydrate load, insulin, liver fat — I set that out in metabolic health, keto and fatty liver.
How do I test the bun swap on my own body?
Run it on yourself, with measurements, before you believe me or anybody else. If you aren’t testing you’re guessing, and guessing is how most people spend a decade on diets.
The home lab is not exotic. It is a notebook, a glucose meter if you can get one, a scale, and a willingness to write down what you actually ate rather than what you meant to eat. Quantify literally everything for two weeks. Same burger, same cheese, same everything, bread one week and no bread the next, and record how you feel at three hours as carefully as you record any reading.
- One variable at a time. Change the bun, not the bun and the beer and the bedtime.
- Write it down the day you eat it. Memory flatters us all.
- Take the numbers to your own physician and let them interpret your panel in the context of your history and your medications.
And expect your results to differ from mine. They will. Two people can run the identical swap and get different readings, for reasons I unpack in why keto works differently for you than for everyone else online, and in what the 600-burger experiment tested when we compared keto with carnivore. I cannot personally guarantee that eating a particular way will fix your panel. What I can tell you is what the flour was doing, and what happened to us when we stopped eating it.
Frequently asked questions
Do bunless burgers put you in ketosis?
Removing the bun lowers the meal’s carbohydrate load, but one bunless burger does not put anybody in ketosis by itself. Ketosis follows from total daily carbohydrate staying low enough, for long enough, that your liver shifts fuel. In the experiment the bun was the first thing to go, not the only thing. Individual results vary.
Is a whole wheat bun better than a white one?
Barely, on the measure that matters here. In the food data we looked at, whole-meal bread scored almost identically to white bread for insulin demand. Fiber and micronutrients are real reasons to prefer whole grain over white. Lower insulin response is not one of them. If you are swapping buns to change insulin, you are mostly changing labels.
Can you eat a burger patty with cheese and stay low carb?
Yes. The patty and the cheese carry almost no carbohydrate, so the meal’s carbohydrate comes from the bun, the ketchup and the fries. That is why lettuce-wrapped burgers became the default in the 30 days. Watch the sauces, because sweetened condiments can quietly return the carbohydrate you just removed.
Does removing the bun cut enough calories to matter?
It cuts some, but calories are not the interesting part of the swap. The bun removes the fastest-digesting portion of the meal, which changes the insulin and hunger pattern that follows it, not just the arithmetic. People often eat less afterward without trying, which is a satiety effect rather than a willpower effect.
Was the bun the only thing changed in the 600-burger experiment?
No, and anybody claiming otherwise is selling you something. The experiment changed the whole shape of the diet: burgers without buns, no sugary drinks, very little else. The bun is the cleanest single thing to point at, but it was one part of a package. That is the honest answer.
The Bottom Line
The bun was never neutral. It was the fastest-acting ingredient on the plate, the reference food that science measures insulin demand against, and the one thing we took away at the start and never gave back. Everything people found shocking about the experiment — that a man could eat burgers every day and walk out with a better panel — runs through that one decision about bread. Your body will respond in its own way, on its own timeline, and your doctor is the person to read your results with you.
So watch the thing and then argue with me. The Keto Project is streaming on Amazon Prime, and the long version, with the arguments I could not fit on screen, is the companion book 600 Burgers in 30 Days on Amazon. Then go put a burger on a plate without the bread and find out what your own body has to say about it. What will you do with it?
Watch The Keto Project on Prime, or read 600 Burgers in 30 Days.
Sources
- Holt SHA, Brand Miller JC, Petocz P. An insulin index of foods: the insulin demand generated by 1000-kJ portions of common foods, Am J Clin Nutr 1997 (Macquarie University record)
- An insulin index of foods: the insulin demand generated by 1000-kJ portions of common foods (Semantic Scholar abstract)
- Holt SHA et al., An insulin index of foods, Am J Clin Nutr 66:1264-1276 (full text and insulin score figure)
- Holt SHA, Brand Miller JC, Petocz P, Farmakalidis E. A satiety index of common foods, Eur J Clin Nutr 1995 (Macquarie University record)
- Satiety value (food scores relative to white bread, from Holt 1995)
- Insulin index (scaling of insulin scores relative to white bread)
- Carbohydrate-last meal pattern lowers postprandial glucose and insulin excursions in type 2 diabetes (PubMed)
- A satiety index of common foods (Holt 1995, full text PDF)
This article is for information only and is not medical advice. Individual results vary. Speak to a qualified clinician before changing how you eat.
The whole experiment is in the film. 600 burgers, 30 days, every blood test — and the ending we never post.
Watch The Keto Project on Amazon