Insulin resistance diet: What are the benefits of this trending eating plan?

The “insulin resistance diet” is popping up more often in conversations about weight loss and blood sugar. The name makes it sound like an established eating plan, but start looking into it, and things get a little less clear: There’s no single insulin resistance diet or official set of rules.

The phrase itself isn’t new. Cheryle Hart, MD, and Mary Kay Grossman, RD, published The Insulin-Resistance Diet in 2001, using a specific method that paired carbohydrates with protein. Other authors have since published different plans under similar names, including The Everything Guide to the Insulin Resistance Diet, which uses a different 10-week eating and activity approach.

What has changed is how much attention insulin and blood sugar are getting. GLP-1 medications like Zepbound® and Wegovy® have helped make terms that once mostly came up in diabetes care part of everyday conversations about weight. According to the CDC, 26.5% of U.S. adults with diagnosed diabetes used an injectable GLP-1 medication in 2024.

That has also fueled interest in glucose spikes, insulin resistance, and whether changing what—or how—you eat can affect either one. But which parts of the insulin resistance diet are actually backed by evidence? And can eating this way improve blood sugar or help with weight loss? Here’s what the research shows and what Maggie Hudspeth, RDN, Senior Manager of Coaching at Noom, says is worth taking from the trend.

What is the insulin resistance diet?

Diet books have used the name “insulin resistance diet” since at least the early 2000s, with different authors offering their own methods. What’s changed recently is the amount of attention the idea is getting, not the basic concept behind it. And there still isn’t one official insulin resistance diet. 

Depending on where you encounter it, you might see recommendations to cut carbs, avoid certain foods, or carefully pair carbohydrates with protein and fat. But the broader idea is much simpler: Eat in a way that supports steadier blood sugar and helps your body respond effectively to insulin.

In practice, that usually means eating more vegetables, fiber-rich carbohydrates, lean protein, and unsaturated fats while limiting refined carbohydrates, added sugars, and highly processed foods. If that sounds familiar, there’s a reason: Much of the advice overlaps with healthy eating recommendations that have been around for years.

“When you strip away the name, a lot of what’s called an insulin resistance diet is really about building balanced meals with fiber-rich carbs, protein, vegetables, and healthy fats,” says Hudspeth. “Those are habits we’d encourage for many people, whether or not they have insulin resistance.”

What is insulin resistance?

To understand the diet, it helps to understand what insulin resistance actually means.

Insulin is the hormone that helps move glucose, or sugar, from your bloodstream into your cells to be used for energy. When you have insulin resistance, cells in your muscles, fat, and liver don’t respond to insulin as effectively. To compensate, your pancreas makes more insulin to get the job done.

At first, that extra insulin may be enough to keep your blood sugar within a normal range. Over time, however, the pancreas may not be able to keep up, causing blood sugar to rise. This can lead to prediabetes and, for some people, eventually type 2 diabetes.

Clinicians don’t typically test directly for insulin resistance during routine care. Instead, they use tests like A1C, fasting blood glucose, and an oral glucose tolerance test that can identify abnormal blood sugar levels and help diagnose prediabetes or diabetes.

Blood sugar vs. insulin resistance: What’s the difference?

Blood sugar and insulin work together, but they aren’t the same thing. NIDDK explains that glucose is a main source of energy, while insulin is the hormone that helps move glucose from your blood into your cells.

• Blood sugar: Rises naturally after you eat carbohydrates.
• Insulin: Helps move that glucose into your cells.
• Insulin resistance: Happens when your cells don’t respond to insulin as well, so your pancreas has to make more of it.

That’s why a “glucose spike” after one meal isn’t the same thing as insulin resistance. A temporary rise in blood sugar is normal; insulin resistance describes how well your body responds to insulin over time.

Researchers often use HOMA-IR, which combines fasting glucose and fasting insulin, to estimate insulin resistance in studies. This helps them look at longer-term insulin sensitivity rather than just what happens after one meal.

What does the research actually say about the insulin resistance diet?

There isn’t one official “insulin resistance diet,” so researchers haven’t studied it as one specific plan. But they have studied many of the eating and lifestyle habits that are usually part of it. Here’s what we know:

• Choosing carbs that keep blood sugar steadier may help. A review of six studies found that diets built around foods that cause a slower, smaller rise in blood sugar improved insulin resistance more than diets with foods that caused bigger blood sugar spikes. That doesn’t mean you need to avoid carbs. Instead, it suggests that the types of carbs you choose may matter.
• Choosing healthier fats may help, too. A ⁠large analysis of over 100 studies found that swapping some saturated fats or carbohydrates for unsaturated fats—especially polyunsaturated fats—improved how the body handled blood sugar and insulin. In everyday life, that might look like eating more fish, walnuts, seeds, avocado, and plant oils.
• Whole grains may be a better choice than refined grains. A ⁠review of 80 studies found that whole grains generally caused smaller increases in blood sugar and insulin after eating than refined grains. They also led to a small improvement in A1C, which reflects average blood sugar over the past few months. But they didn’t improve every measure of insulin resistance researchers looked at.
• Losing some weight and moving more can make a meaningful difference. In a ⁠major study of people at high risk for type 2 diabetes, participants who made lifestyle changes with the goal of losing at least 7% of their starting weight and getting at least 150 minutes of activity per week reduced their risk of developing type 2 diabetes by 58%. A ⁠10-year follow-up found that the group originally assigned to the lifestyle program still had a 34% lower rate of diabetes.

One important thing to keep in mind: That study wasn’t testing an “insulin resistance diet.” People changed several things at once, including what they ate, how much they moved, and their body weight. That means we can’t point to one food—or one specific way of eating—as the reason it worked.

Overall, many of the habits associated with an insulin resistance diet are backed by research. What we don’t know is whether you need a special diet with that label. So far, there’s no clear evidence that an “insulin resistance diet” works better than other balanced ways of eating that emphasize nutritious foods, regular movement, and habits you can stick with.

“You don’t need to overhaul your diet based on one blood sugar spike or eliminate an entire food group,” says Hudspeth. “The research points us back to the overall pattern—what you eat consistently over time matters much more than trying to make every meal perfect.”

The insulin resistance diet: Foods that are often recommended

One of the major pros of the insulin resistance diet is the flexibility and choice. While some people may prefer something that follows an exact rulebook, Hudspeth says that flexibility can actually be a strength.

“A lot of what’s called an insulin resistance diet is really familiar nutrition advice—more fiber-rich carbohydrates and vegetables, enough protein, and healthy fats,” Hudspeth says. “Eating a balanced mix of these foods can help support steadier blood sugar, energy, and overall metabolic health.”

There’s no official food list for an insulin resistance diet, but most versions emphasize minimally processed foods that provide fiber, protein, and healthy fats while limiting added sugars and highly refined foods.

• Fiber-rich carbohydrates: Oats, beans, lentils, quinoa, barley, sweet potatoes, and whole grains provide fiber and generally digest more slowly than highly refined carbohydrates. Research on lower-glycemic eating suggests these types of choices may help improve insulin sensitivity.
• Non-starchy vegetables: Broccoli, spinach, peppers, zucchini, green beans, and cauliflower provide fiber and nutrients while generally having a relatively small effect on blood sugar.
• Unsaturated fats: Olive oil, avocado, nuts, seeds, and fatty fish provide unsaturated fats. Research suggests replacing some saturated fats or carbohydrates with unsaturated fats may benefit blood sugar regulation.
• Protein-rich foods: Fish, chicken, eggs, tofu, and plain Greek yogurt can help make meals more filling. Protein may play a supporting role in blood sugar management, although the evidence for directly improving insulin resistance is more mixed.
• Fruit: Berries, apples, pears, and other whole fruits provide carbohydrates along with fiber, vitamins, and minerals. Having insulin resistance doesn’t mean you need to avoid fruit.
• Water and unsweetened drinks: Water, sparkling water, and unsweetened coffee or tea can replace sugary drinks and help reduce added sugar.

The insulin resistance diet: Foods to limit

Most versions of the insulin resistance diet recommend having foods high in added sugar and refined carbohydrates less often. These foods are often lower in fiber and digested quickly, which means they can cause blood sugar to rise faster.

Research supports choosing less-refined options more often. In a ⁠review of 80 studies, whole grains generally led to smaller rises in blood sugar and insulin after eating compared with refined grains. That doesn’t mean you have to give up white bread or white rice, but choosing whole-grain options when you can may help keep blood sugar steadier.

Sugary drinks are another good place to cut back. A ⁠large review of the research found that people who drank more sugar-sweetened beverages had a higher risk of developing type 2 diabetes. That doesn’t mean an occasional soda causes diabetes. But regularly choosing water or another unsweetened drink instead can be a simple way to cut back on added sugar.

Foods to have less often include:

• Sugary drinks: Soda, sweetened tea, energy drinks, and other drinks with added sugar
• Sweets and desserts: Candy, cookies, pastries, and other foods high in added sugar
• Refined grains: White bread, sugary cereals, and other lower-fiber grain products
• Highly processed snack foods: Chips, crackers, and similar packaged snacks

But “limit” doesn’t mean “never eat.” Having dessert or ordering white rice doesn’t undo an otherwise balanced diet. In fact, making too many foods completely off-limits can make an eating plan harder to stick with over time.

“If improving your diet starts to feel like you can never eat bread, pasta, or dessert again, it’s probably becoming more restrictive than it needs to be,” Hudspeth says. “What you eat most of the time is more important than trying to eat perfectly.”

Insulin resistance diet: Sample 3-day plan

If you put the recommendations commonly associated with an “insulin resistance diet” together on a plate, they look a lot like a balanced, healthy eating pattern: meals built around vegetables, fiber-rich carbohydrates, protein, and healthy fats.

There’s no special formula or list of foods you have to eat. This sample three-day plan is simply one example of how you might put these general principles into practice.

“A meal that supports steadier blood sugar doesn’t have to be complicated,” says Hudspeth. “Start with a protein and a vegetable, add a fiber-rich carbohydrate, and include some healthy fat. It’s a simple framework you can adjust based on the foods you actually enjoy.”

	Breakfast	Lunch	Snack	Dinner
Day 1	Eggs with sautéed vegetables and whole-grain toast	Grilled chicken salad with chickpeas and olive-oil vinaigrette	Apple with almonds	Baked salmon, roasted broccoli, and quinoa
Day 2	Plain Greek yogurt with berries, walnuts, and oats	Lentil soup with a side salad	Carrots with hummus	Chicken or tofu stir-fry with vegetables and brown rice
Day 3	Oatmeal with berries, chia seeds, and peanut butter	Whole-grain wrap with turkey or tofu and vegetables	Pear with cheese or nuts	Baked fish or tempeh, sweet potato, and green beans

The insulin resistance diet: FAQs

Does the insulin resistance diet help with weight loss?

It can, depending on what and how much you eat, but there’s no evidence that a specific “insulin resistance diet” is better for weight loss than other balanced approaches. One ⁠randomized trial found that personalized diets designed to keep blood sugar steadier after meals didn’t lead to significantly more weight loss than a standard low-fat diet.

Is the insulin resistance diet an official diet?

No. There’s no single, officially recognized insulin resistance diet or set of rules. The term is used to describe different approaches that generally focus on keeping blood sugar steadier and supporting overall metabolic health.

How do I know if I have insulin resistance?

You usually can’t tell from symptoms alone. There also isn’t one routine test used to diagnose insulin resistance itself. Instead, your clinician may use tests such as A1C, fasting blood sugar, or an oral glucose tolerance test to look for signs of prediabetes or diabetes.

What is the best diet for insulin resistance?

There isn’t one diet that’s best for everyone. The ⁠American Diabetes Association recognizes several eating patterns that can support metabolic health, including Mediterranean-style, DASH, plant-based, and lower-carbohydrate approaches. The best fit is generally one that meets your nutritional needs and that you can stick with over time.

Does diet soda cause insulin resistance?

We don’t have evidence that diet soda directly causes insulin resistance. Some research has found a link between higher artificial sweetener intake and type 2 diabetes risk, including a study, but that doesn’t prove sweeteners caused the increased risk. A separate review found that drinks with non-nutritive sweeteners didn’t have worse short-term effects on blood sugar or insulin than unsweetened drinks.

Can insulin resistance improve?

Yes. Changes like eating a balanced diet, getting regular physical activity, and losing weight when appropriate can improve how your body responds to insulin and lower your risk of developing type 2 diabetes. In the landmark ⁠Diabetes Prevention Program, intensive lifestyle changes reduced the risk of developing type 2 diabetes by 58% among adults at high risk.

Does insulin resistance always lead to diabetes?

No. Having insulin resistance can increase your risk of developing prediabetes and type 2 diabetes, but it doesn’t mean you’ll definitely develop diabetes. Lifestyle changes can substantially lower that risk, especially for people who are already at higher risk.

Is insulin resistance related to PCOS/PMOS?

Insulin resistance is common in people with polycystic ovary syndrome, which is now called PMOS. When the body has to make more insulin to keep blood sugar under control, those higher insulin levels can also affect the ovaries and may contribute to higher androgen levels, irregular periods, and other symptoms.

That’s why improving insulin sensitivity can be part of PCOS treatment—not just for blood sugar, but potentially for some of the hormone-related effects of the condition.

Read more: PCOS to PMOS: Why polycystic ovary syndrome has a new name

The bottom line: The insulin resistance diet isn’t one diet—but many of its principles are backed by research

The insulin resistance diet sounds like one specific plan, but there’s no official version. Different authors and creators have used the name for decades.

What matters more is the science underneath it. Research supports many of the habits commonly included in these plans, including choosing fiber-rich carbs, replacing some saturated fats with unsaturated fats, eating more vegetables, and staying active.

You don’t need to eliminate carbs or find the “right” version of the diet. Focus on the evidence-backed habits that work for you and that you can maintain over time.

If you’re looking for support building sustainable habits around blood sugar and weight, Noom can help you create a personalized approach without relying on rigid food rules. Download Noom on iOS & Android to get started.