We hear about it all the time nowadays: people who are already dealing with high blood pressure are falling prey to diabetes as well. Most folks think of them as two separate issues: one tied to salt, the other to sugar. But as it turns out, they’re way more connected than we realize, and doctors have noticed this overlap for years.Lately, cardiovascular experts have started to explain what’s really going on.Dr. Jeremy London, a cardiothoracic surgeon from the US, who goes by the username “drjeremylondon” on Instagram, doesn’t blame salt alone. He says the real explanation involves sugar, insulin, and the way the body manages energy.He calls it a “silent link,” and scientific research backs him up. The same body process, insulin resistance, can trigger both conditions.Let’s break it down.
The big connection: Insulin resistance
Insulin resistance is at the core of the diabetes-high blood pressure relationship.Here’s what happens: your cells stop responding to insulin, the hormone that lowers blood sugar. Doctors see the pattern all the time. People with diabetes are more likely to develop high blood pressure, and those with hypertension usually show signs of insulin resistance, the early stage of type 2 diabetes.It’s not just random; there’s a common thread here. The way your body handles sugar and insulin affects tons of systems, especially your heart and blood vessels. For years, everyone thought salt was the main bad guy for high blood pressure. Sure, it matters, but Dr. London says sugar is just as important, and people often overlook it.As Dr. London put it, “Sugar’s effect on blood pressure works largely through insulin. When you eat a lot of refined sugar, insulin spikes, and insulin signals the kidneys to hold onto sodium and water — which raises blood pressure.”He added, “High sugar intake also stimulates the sympathetic nervous system, increasing heart rate, renin secretion, and vascular resistance.”In simple terms, if you eat a ton of sugar or refined carbs, your blood sugar rockets up. Your body responds by pumping out more insulin to move glucose into cells. But do this over and over, and your cells start ignoring insulin; insulin resistance kicks in.That’s where things start to go sideways.Real scientific studies prove it. One published by Nature Scientific Reports in 2024 found that insulin resistance actually increases the risk of developing hypertension. So it’s not just some coincidence. The same glitch that causes type 2 diabetes also sets the stage for high blood pressure.
How insulin resistance raises blood pressure
Insulin resistance doesn’t just mess with blood sugar; it flips a bunch of switches in your body that can push blood pressure higher.Here’s what happens:The kidneys hold onto more salt and water. Insulin tells the kidneys to keep sodium and fluid. When insulin stays high all the time, you end up with more blood volume, which spikes blood pressure.Then the blood vessels narrow. Insulin resistance lowers nitric oxide, a molecule that helps blood vessels relax. Without enough, those vessels tighten, which ramps up resistance and boosts blood pressure.Chronic inflammation and damage also play a huge part. Insulin resistance is tied to inflammation and oxidative stress, which hurts blood vessels, making your arteries stiff, which is a big factor in stubborn hypertension.Scientific studies confirm all this. Research in Hypertension Research shows that people with diabetes experience increased vascular resistance and fluid retention, both of which boost blood pressure.
The bigger problem: Metabolic dysfunction
Really, both diabetes and hypertension have the same root: metabolic dysfunction. That’s just a fancy way of saying your body isn’t handling energy, sugar, and fats well anymore. Dr. London says these issues rarely happen by themselves. Usually, they’re part of a bigger cluster called metabolic syndrome, which includes:high blood sugarhigh blood pressureToo much belly fatabnormal cholesterol levelsPut them together, and the risk for heart disease and stroke shoots up.Metabolic syndrome is a serious global health problem now. Insulin resistance drives all these conditions, linking what seem like separate issues into one tangled web.So, treating just one thing, like lowering blood pressure or controlling blood sugar, is not enough. You need to tackle the deeper metabolic problem.
Diabetes and high blood pressure: The relationship works both ways
Diabetes and high blood pressure feed off each other. If you have diabetes, you’re more likely to develop hypertension because your metabolism and blood vessels change. If you already have hypertension, there’s pretty much always some insulin resistance lurking beneath, making diabetes more likely too.Scientific studies prove this. People with high blood pressure tend to have insulin resistance before diabetes actually shows up, and long-term research keeps finding that both conditions share this common thread, even before any symptoms hit.
How to tackle both issues?
The modern diet, which is made up of processed foods, added sugars, and refined carbs, is making everything worse. Frequent sugar spikes trigger constant insulin overload, which slowly tips your body toward both diabetes and hypertension. Being sedentary doesn’t help, either; it makes your body worse at using glucose.That’s why younger people now get both conditions, not just older adults.The mix of diabetes and hypertension is bad news for your heart and blood vessels. Damage piles up faster, raising your risk for heart disease, stroke, kidney issues, and vision loss. When both conditions exist, vascular dysfunction, inflammation, and stiff arteries come on strong, so acting early matters.So, what to do about it?Dr. London’s big takeaway? Treating high blood pressure and diabetes separately doesn’t cut it. Since they share the same root cause, you gotta take them on together. Per him, “Salt still matters but if you want to lower your blood pressure, stop ignoring sugar.”Here’s how you can achieve that:Cut back on sugar, not just salt.Keep blood glucose steady.Boost insulin sensitivity with a good diet and exercise.Take care of your overall metabolic health.
