Have you ever wondered why some people gain weight easily or suffer from high blood sugar? It may be related to insulin resistance. This occurs when the body’s cells do not respond well to insulin, the hormone that regulates blood sugar. If left unchecked, it can lead to serious problems such as type 2 diabetes, heart disease, and even some cancers.
In the video above, Dr. Peter Attia, who received his medical degree from Stanford and completed his surgical residency at Johns Hopkins Hospital, is interviewed by renowned diabetes researcher and clinician Dr. Ralph DeFronzo.1 They discuss what insulin resistance is, how it affects specific organs, and exactly how to determine if you have insulin resistance. But here’s some good news. Simple changes, especially to your diet, can improve your insulin sensitivity.
What is insulin resistance?
Insulin is like a key that unlocks your cells so they can take up sugar (glucose) from the blood. When you eat food, your body turns the food into sugar, which enters your bloodstream. Insulin then moves that sugar into the cells to provide energy. However, if you have insulin resistance, your cells do not respond well to insulin.
The lock on the cell appears to be rusty. The key doesn’t work properly. As a result, sugar builds up in the blood, and the body secretes more insulin to fix it. Over time, blood sugar levels rise and too much insulin is produced, which is not good for your health.
• Why should you care? Insulin resistance isn’t just a small problem; it’s associated with serious health risks. If cells are unable to use insulin properly, the following may occur:
◦ Type 2 Diabetes — Too much sugar in the blood causes damage to the body over time.
◦ Heart disease – High insulin levels harm blood vessels.
◦ Certain cancers — Some studies suggest that insulin resistance may increase the risk of cancers such as breast or colon cancer.
The bright side? You can fight back by understanding what’s happening and making smart choices, like adjusting your diet.
• How does diet improve insulin sensitivity? What you eat has a significant impact on how well your body uses insulin. Let’s break this down and see how diet can help or hurt insulin sensitivity.
• What about linoleic acid (LA)? One important thing to note is a fat called linoleic acid (LA). It is found in seed oils commonly used in processed foods such as chips, fried snacks, and baked goods. A little LA is okay, but too much can harm cellular energy production and cause inflammation. Think of the inside of your body as being stimulated.
These stimuli further worsen insulin resistance. To keep your body healthy, cut back on these processed foods and instead eat healthier fats like ghee, tallow, and grass-fed butter.
• How is redox balance achieved? Another piece of the puzzle is something called redox balance. Imagine it as a seesaw of cells that keep everything running smoothly. When this seesaw becomes unbalanced, it disrupts the way cells use insulin. Eating foods full of antioxidants, such as colorful fruits and vegetables, can help keep your seesaw steady and increase insulin sensitivity.
Insulin Resistance—A Problem with Your Cellular Energy Factories
Now let’s dig a little deeper. Insulin resistance isn’t just about sugar, it has to do with the way your cells make energy. Here’s what you need to know:
• What Causes Insulin Resistance? Cells have tiny power plants called mitochondria that turn sugar into energy. When these power plants do not function properly, it is called mitochondrial dysfunction. Think of it like a factory with broken machines. Machines can’t keep up. This interferes with the way cells use insulin, causing insulin resistance.
Seed oils play a big role here because LA is a mitochondrial poison that impairs cellular energy production. Once rare, seed oils are now used everywhere in processed foods such as baked goods, frozen foods, and salad dressings. Refined sugar also plays an important role.
Unlike the natural sugars in fruit, which contain fiber and nutrients, refined sugar offers no nutritional benefits and significantly increases health risks. Consuming too much refined sugar can overload your mitochondria and make them less efficient. Over time, this causes the body to become insulin resistant.
• How does a redox imbalance make things worse? There is also something called redox imbalance. Inside the cell, there is a balance of beneficial and harmful particles. Too much refined sugar or unhealthy fats (such as LA) interfere with this, causing stress that damages the mitochondria. This is equivalent to overloading the circuit. Everything starts to break down. This stress makes it difficult for insulin to do its job, bringing us closer to insulin resistance.
• Why is this important for your health? When mitochondria suffer, insulin resistance causes bigger problems.
◦ Type 2 Diabetes — Blood sugar levels remain high because the cells cannot use the blood sugar.
◦ Heart problems — Impaired energy production affects the heart and blood vessels.
◦ Brain Health — Some experts call Alzheimer’s disease “type 3 diabetes” because of the brain’s insulin resistance.
correction? Diet and lifestyle changes can help your mitochondria work better and improve insulin sensitivity.
Early detection of insulin resistance using HOMA-IR
One of the simplest and most reliable ways to measure how well your body handles insulin is with a test called HOMA-IR, which stands for Homeostatic Model Assessment of Insulin Resistance.
Unlike other cumbersome procedures, HOMA-IR requires only two basic blood tests: a fasting blood sugar test and a fasting insulin level test first thing before breakfast. These tests are relatively inexpensive and widely available in most laboratories. Armed with these numbers, you then plug them into a simple formula to get your HOMA-IR score.
HOMA-IR = (Fasting blood sugar (mg/dL) × Fasting insulin (μU/mL)) / 405
The goal is to determine how hard your body is working to maintain blood sugar levels. A HOMA-IR higher than 1.0 is usually a warning sign that you have entered the realm of insulin resistance. Lower scores indicate better insulin sensitivity, so it’s worth paying attention even to values hovering around 1.0 if you’re trying to optimize your health.
The beauty of HOMA-IR lies in its simplicity. There is no need for multiple visits or complicated testing procedures. You wake up, don’t eat or drink anything except water, head to the lab for a quick blood draw, and get the results back soon after. Alternatively, Mercola Labs has a dried blood test card that lets you stand up, prick your finger, place a drop of blood on the card, and then mail it in, which is much more convenient and cheaper.
This is a far cry from the optimal research method known as the euglycemic hyperinsulinemic clamp, introduced by DeFronzo in 1979, in which participants are hooked up to IVs for hours. In the clamp procedure, researchers administer insulin and glucose simultaneously to measure exactly how much glucose is needed to keep blood sugar at a constant level when insulin is injected.
Although this process is highly accurate, it is time-consuming and inconvenient, making it impossible to perform routine monitoring in a clinical or routine setting. It’s also expensive, costing an average of $1,000 for a single test. As a result, this is primarily limited to research settings.
That’s why HOMA-IR remains a powerful tool in both scientific research and personal health care. In other words, it balances accuracy and practicality. It’s not a perfect snapshot. No single test can capture the full complexity of metabolic health. However, it is robust enough to highlight when the body begins to resist insulin signaling.
I was shocked that DeFronzo, who invented the euglycemic hyperinsulinemic clamp test, and Attia, one of the smartest biohackers around, failed to acknowledge that the HOMA-IR test, unlike the test DeFronzo invented, is a practical, simple, and inexpensive way to measure insulin resistance.
By using the HOMA-IR test and catching early warnings, you can make adjustments to your diet and lifestyle long before you run into more serious problems. For most people, when your HOMA-IR is above 1.0, it’s time to pay closer attention to factors like sugar intake, seed oil and plastic exposure, and gut health.
As you adjust these elements of your routine over time, you can retest the HOMA-IR and see if your score drops. That direct feedback can be powerful motivation to move you toward a healthier, more vibrant life.
Practical Tips to Increase Insulin Sensitivity
Are you ready to make a change? Here’s how to improve your insulin sensitivity through diet:
1. Eat more whole foods containing healthy carbohydrates. Carbohydrates play an important role in supporting mitochondrial function. Glucose, derived from carbohydrates, serves as the cells’ preferred fuel source for energy production. Instead of limiting carbohydrates, focus on eating 200 to 350 grams of the right types, such as whole fruits, root vegetables and well-tolerated whole grains. If you have dysbiosis, avoid fiber until your gut heals.
2. Reduce processed foods — Avoid processed foods. Processed foods are full of LA-rich seed oils and refined sugars, which cause inflammation and worsen insulin resistance.
3. Choose Healthy Fats — Swap out canola, corn, and soy oil for healthy fats like grass-fed butter, tallow, and ghee.
4. Move your body — Exercise is not a food, but it helps your cells use insulin better. Walking every day does wonders.
Small steps like these help your body re-respond to insulin and lower your health risks. Start small. Swap store-bought bread for fresh fruit or take a walk outside every day. These positive changes can make a huge difference to your health.
FAQ — Answers to your key questions about insulin resistance
cue: What foods help with insulin sensitivity?
no way: Prioritize eating healthy carbohydrates, such as fruits and root vegetables, and avoid seed oils that are high in linoleic acid. Avoid processed foods high in refined sugars and unhealthy fats.
cue: How do doctors determine insulin resistance?
no way: They often use HOMA-IR, a simple test that includes fasting blood sugar and insulin levels. Hyperinsulinemic-euglycemic clamps are considered the gold standard, but HOMA-IR is cheaper and more practical for routine use.
cue: Can exercise cure insulin resistance?
no way: Yes. Moving your body helps your cells utilize insulin better. Even walking every day can help improve insulin sensitivity.
cue: What are the long-term health risks associated with insulin resistance?
no way: Insulin resistance has been linked to serious conditions such as type 2 diabetes, heart disease, and even some cancers. To prevent these chronic diseases, it is important to address insulin resistance through diet and lifestyle changes.
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