What the medicines actually do — which number each one manages, and what turning off the flood does that none of them can.
The food most people eat most of — bread, rice, pasta, potatoes, cereal, sugar — becomes glucose in the blood. To deal with it, the body releases insulin, a doorman that ushers the glucose out of the blood and into the cells. If the flood never stops — meal after meal, year after year — the cells get tired of the constant knocking and stop listening. That's insulin resistance, the quiet engine underneath a great deal of modern disease.
Type 2 diabetes is what happens when that engine has been running for years.
So let's ask the four questions this whole series is built on — the ones a curious person asks when they refuse to just be told. (New here? Start with Part One — but this stands on its own.)
You'll usually hear it called a disease of high blood sugar. Your sugar's too high; the drugs bring it down; done. True as far as it goes — but it quietly points you at the wrong thing.
High blood sugar is the smoke, not the fire. Ask why it's high. It's high because the glucose can't get into the cells — the doorman is knocking and the cells have stopped answering. The sugar is stuck in the blood because the door won't open.
This changes what "treating" it even means. If the disease is the high number, anything that lowers the number looks like a cure. But if the number is just the smoke, lowering it while the fire still burns isn't treatment — it's hiding the warning light. Which, as you're about to see and try for yourself, is very nearly what most of the drugs do.
One more thing to hold: in type 2 diabetes there usually isn't too little insulin — early on there's too much, the body screaming louder and louder to be heard. Remember that. It's the key to seeing what some of the drugs get wrong.
Here's where understanding the machine pays off. Below is a body with type 2 diabetes: the flood pouring in, blood sugar stuck high, insulin stuck high, cells not listening. Try each drug and watch what it actually does — and above all, watch the top bar: the flood pouring in. See which drugs touch it, and which just fiddle with the number below.
Did you catch it? Metformin nudges the number gently and works most with the body. The sulfonylurea forces out more insulin — more of the very thing that caused this. The gliflozin (the class doctors call SGLT2 inhibitors) drains sugar into your urine — clever, with real heart and kidney benefits, but the tap's still running. Only the injection (a GLP-1 drug) touched the flood itself — because it works by making you eat less. And the diet turned the flood off at the source entirely.
The one drug that works best is the one that comes closest to turning the flood down.
That isn't a coincidence. It's the whole answer, hiding in plain sight in the drug companies' own results. And if turning the flood down is what works — you can turn the flood down.
You can probably answer this yourself now. If type 2 diabetes is caused by years of glucose flooding a body that can't keep up, then addressing the cause means turning off the flood — eating far less of the bread, rice, pasta, potatoes and sugar that become glucose in the first place.
And here's what was called impossible for decades: when you do that, the disease can go into remission. Not "managed." Not "controlled with medication." Actually reversed — blood sugar back to normal, often with the drugs reduced or stopped.
The disease everyone was told is chronic and only ever worsens can, for many people, be turned around.
Your doctor isn't hiding anything. Most doctors were taught, as settled fact, that type 2 diabetes is chronic and progressive, managed with an ever-growing list of drugs — and many were taught that dietary fat was the danger and starchy carbs should be the base of the plate, the exact opposite of what turning off the flood requires. They're working faithfully from the map they were given.
But look at the shape of it. A person with type 2 diabetes on three or four drugs for life is a substantial, dependable source of income. A person who reverses it with food buys nothing, forever.
A lifelong customer is a better business than a cure.
Nobody has to be a villain for that to bend the whole system toward lifelong management. The scientists who built the injections are brilliant and, in the main, genuinely trying to help — the drugs are real achievements. But the incentive runs one way, and a truth that ends the need for the product will always struggle to be the headline. Which is exactly why it helps to understand it yourself.
If you take medication for type 2 diabetes and you feel the pull to try turning off the flood, read carefully — because here the food doesn't just complement the drugs, it can collide with them.
The answer isn't to avoid changing how you eat. It's to do it with your doctor, so they lower the medication as the food does the work. A doctor reducing your diabetes drugs because your blood sugar is improving is exactly the direction you want — but it has to be them adjusting the doses, not you.
So the rule is simple: bring this to your doctor. Say you want to reduce the carbohydrate flood, and ask them to adjust your medication safely as you go. A good doctor will be glad to — helping you need less medication is the best kind there is. The goal was never to abandon medical care. It's to aim it, at last, at the cause.
Don't take this on faith. If you have type 2 diabetes, or you're heading toward it, this is a disease you can watch respond — sometimes within days.
Do that, and you'll no longer be believing anyone — not me, not a headline, not even a doctor. You'll be reading the answer off your own body. And a person who has seen their own "chronic, progressive" diabetes turn around cannot be un-convinced.
Ask your body. It's the one authority that can't lie to you.
Part Three will take the same four questions to another condition and its drugs — piece by piece, the same way of seeing, until you can do it yourself for almost anything a doctor hands you.