Is Insulin Resistance Driving These 12 Kinds of Cancer?

I’ve been talking about insulin resistance for well over a decade.

And that’s because balancing blood sugar is essential to better health.

I’m not saying all diseases are caused by “bad blood sugar,” but for certain in my clinical practice, insulin resistance shows up again and again and serves as a root issue behind a wide range of conditions. Whether that’s fatigue, weight gain, brain fog, cardiovascular disease, or, eventually, for some people, diabetes, there’s no way to escape the fact that insulin resistance is a major issue in the developing world. 

If you’ve followed my work, you’ve seen me write about how it impacts metabolic health, energy production, and long-term disease risk.

Recently, the amount of evidence connecting insulin resistance to even more serious outcomes has increased

What the New Research Is Showing

Insulin resistance is not just a blood sugar issue.

It’s a problem of how your cells respond to insulin over time. When that signaling breaks down, glucose has a harder time entering cells, and your body compensates by producing more insulin. Over time, this creates a very different internal environment.

One marked by higher insulin levels, chronic low-grade inflammation, and disrupted cellular repair.

Research is showing that this environment matters in ways we didn’t fully appreciate before.

A recent large-scale analysis, using machine learning and long-term population data, adds another layer to this.

Instead of looking at a single lab value, researchers built a model that estimates insulin resistance based on common health data (age, blood sugar, triglycerides)and applied it to a large population over time.

What they found is that individuals identified as insulin resistant showed higher rates of multiple chronic conditions, including diabetes, cardiovascular disease, and cancer.

More specifically, the analysis linked insulin resistance to 12 different types of cancer, with stronger associations in certain cases.

Uterine cancer risk was markedly higher, with meaningful increases also seen in kidney, esophageal, pancreatic, colon, and breast cancers.

This doesn’t mean insulin resistance “causes” cancer in a simple, direct way.

The data they collected is merely observational.

But… the pattern is consistent, and the biology behind it is increasingly well understood.

One of the key ideas here is that insulin itself is a growth signal.

When your body produces more insulin to compensate for resistance, that signal stays elevated. Over time, it interacts with pathways like IGF-1, which regulate how cells grow, divide, and survive. In that environment, abnormal cells may gain an advantage.

At the same time, insulin resistance is often accompanied by chronic inflammation, which alters the cellular environment. Instead of efficiently clearing out damaged cells, the system becomes less precise.

That combination, growth signaling plus inflammation, is one of the early patterns we see in many chronic diseases.

What’s also important, and often overlooked, is timing.

In this analysis, insulin resistance showed up years before disease diagnosis. People flagged as insulin resistant were far more likely to go on to develop diabetes and other conditions over time.

Why This Changes How I Think About Risk

One of the more interesting findings was that metabolic health mattered more than body weight alone.

People tend to think that being overweight is the key metric to track.

But, as I’ve shown before, you can be at your ideal BMI but still display poor metabolic health, which presents a risk

People with higher body weight but without insulin resistance did not show the same risk patterns. Meanwhile, those with insulin resistance did…even at similar weights.

The number on the scale doesn’t tell the whole story.

Sure, it matters, and it’s a good number to keep within the healthy range… but what truly matters more is how the body handles energy and processes glucose.

What matters is how the produces energy at the cellular level, and how stable those systems are over time.

When those systems are off, well, you’re going to see it pop up as various health concerns.

The encouraging part of this conversation is that insulin resistance is both reversible and preventable.

As it develops over time, it can often be improved by addressing the conditions that created it in the first place.

And when you either reverse it or prevent it, the myriad downstream processes remain stable.

With that, chronic Inflammation can be limited, and hormonal signaling remains protected.

Essentially, your body becomes more resilient.

There are several areas where both research and clinical experience point in the same direction.

Reducing exposure to highly processed fats, particularly certain industrial seed oils (something I’ve been saying you should do for years), may help support metabolic function, though there is still evidence revolving around this. 

Nutrition absolutely matters, too.

But this isn’t about a strict type of diet.

What you should focus on more is whether you can consistently fuel your cells without creating excess stress. For some, that means adjusting carbohydrate intake to better match their tolerance and digestion.

Gut health also plays a role. There is growing evidence that the microbiome influences insulin sensitivity and that certain bacterial byproducts, such as short-chain fatty acids, may support metabolic stability.

The gut is your “second brain,” as I’ve said before.  So if you smarten up, you’ll see health improvements almost guaranteed. 

And of course, movement is one of the most reliable tools we have. Regular activity…especially walking and resistance training…helps muscle cells take up glucose more efficiently, often with less reliance on insulin.

Environmental inputs matter more than people expect. Things like sleep, stress, and even exposure to certain chemicals can influence metabolic signaling. These are not always the first areas people look at, but they often make a difference over time.

And finally, there’s measurement.

Tools like HOMA-IR (more on that here) provide a practical way to assess insulin resistance early.

They’re not perfect, but they offer a clearer picture than glucose alone and allow for tracking changes over time.

What Not to Forget about Insulin Resistance

I’d be willing to bet most people think Insulin resistance is just a step on the path to diabetes.

In fact, it’s a broader metabolic signal that shows up across multiple systems, including those involved in cancer risk.

The good news is it’s also one of the more modifiable pieces of the puzzle.

In practice, the goal is not to chase perfect numbers or apply extreme interventions. It’s

to gradually shift the environment in which the body operates. This way, energy production is steady, signaling is balanced, and the system can function as designed.

Balance your blood sugar, and you’re going to be way ahead of the game as it relates to a better, more enjoyable life!