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The Best Diet for Insulin Resistance Made Simple
Many believe a "diet" needs to have a specific name. Low-carb, Mediterranean, elimination diets. There is no reason to assume that the diet that will work for you is one that has a specific name. What is important is that the diet you choose is able to create enough weight loss to improve your insulin sensitivity. Research supports that the best way to achieve sustained weight loss is to eat in a way that you can keep up long term.
Why insulin resistance matters
Insulin is a hormone produced by the pancreas. It's primary function is to help get glucose out of the bloodstream and into cells. After you eat, your blood glucose level increases. The pancreas produces insulin, which acts like a key that unlocks the cells allowing glucose to enter. As you continue to eat throughout the day, your blood glucose continues to increase. The pancreas produces more and more insulin. Eventually, the cells become resistant to the insulin. Instead of letting glucose in, the cells say "no". More insulin is produced to try to allow glucose to get into the cells. Eventually, the pancreas cannot produce enough insulin. Blood glucose stays too high. At first, there may be no noticeable problems. However, if the problem is not addressed, it can lead to serious complications. Some of these complications include:
- Damage to your eyes, kidneys, heart and nerves due to chronically elevated glucose.
- Increased risk of developing cardiovascular disease. Cardiovascular disease includes conditions such as coronary artery disease (heart attack), stroke and peripheral vascular disease.
- Increased risk of infection.
- Increased inflammation.
- Type 2 Diabetes.
Why weight loss is such a powerful lever
Excess body fat, particularly in people who have obesity, is a major contributor to the development of insulin resistance. Losing weight is a proven method of reducing insulin resistance. A meta-analysis of studies that included overweight individuals with type 2 diabetes found a strong correlation between weight loss and improved blood sugar control. Each kilogram of weight lost resulted in a decrease of approximately 0.1% in HbA1C. HbA1C is a measure of your average blood glucose over a period of three months. A one percent decrease in HbA1C is considered to be a clinically significant improvement. A ten kilogram weight loss, therefore, would potentially move someone from the diabetic range to the non-diabetic range.
Why visceral fat matters more than the fat you can see
Fat is not created equal. Subcutaneous fat is the fat located beneath the surface of the skin. Visceral fat is located within the abdominal cavity and surrounds internal organs. Visceral fat is significantly more metabolically active than subcutaneous fat and is strongly associated with insulin resistance. While weight loss will typically lead to both a reduction in subcutaneous and visceral fat, the reduction in visceral fat is more closely correlated with improved insulin sensitivity. This raises the question of whether the best diet for weight loss and improved insulin sensitivity specifically targets visceral fat.
What newer research says about low-carb versus higher-carb diets
A randomized clinical trial published in 2022 compared the effects of three different carbohydrate patterns on visceral fat loss in adults with obesity. Participants were randomly assigned to one of three diets that had similar caloric content, but differed in their carbohydrate composition:
- Whole grain flour-based carbohydrates (such as bread and pasta)
- Minimally processed carbohydrates (such as fruits, potatoes, and rice)
- A low-carbohydrate diet with increased fat
All groups were advised to limit or avoid added sugars and sugary beverages. Visceral fat was measured at baseline, six months, and twelve months.
While the results may not have been what many people expected, all three groups experienced significant reductions in visceral fat. However, the difference in visceral fat loss between the three groups was not statistically significant. While the low-carbohydrate group did experience the greatest degree of visceral fat loss, the minimally processed carbohydrate group also experienced significant amounts of visceral fat loss. The study authors noted that there were trends that suggested the low-carbohydrate and minimally processed carbohydrate groups may have had slightly greater degrees of visceral fat loss, however, the sample size of the study was too small to confirm these findings as statistically significant.
Study limitations that matter
One of the biggest limitations of the study was its dropout rate. The study began with 193 participants and only had 57 remaining at twelve months. High dropout rates can skew the results of a study, as the individuals who do not lose weight tend to be the ones who drop out of the study. Therefore, while the findings of the study are not entirely invalidated, they should be interpreted with caution.
The common factor that mattered most
Although the three diets differed in terms of their carbohydrate content and food choices, they had one thing in common: they created a mild calorie deficit. Calorie deficit is the single most important factor contributing to weight loss, regardless of the specific diet being followed. This is one of the reasons why many diets appear to be similar after six months and begin to diverge in terms of effectiveness at twelve months.
Why adherence is the real bottleneck
At approximately six months, most structured diets produce comparable amounts of weight loss. However, by twelve months, a significant proportion of the weight lost is typically regained. This is not a failure to follow through on one's commitment to a particular diet; rather, it represents the difficulty of maintaining highly restrictive eating patterns for extended periods. Therefore, the best diet is generally the one that a person can adhere to for years, not weeks.
Simple dietary strategies that make calorie deficit easier
Instead of focusing on finding the "perfect" diet, it is often more beneficial to focus on the fundamental principles of the diet that support sustaining a calorie deficit in a manner that is not overly restrictive. Some of these strategies include:
Increase fiber intake when appropriate
Increasing your fiber intake can improve feelings of fullness and reduce overall caloric intake. In a study, increasing fiber intake by 14g/day resulted in:
- Approximately 10% fewer calories consumed
- About 1.9kg of weight loss
Increasing your fiber intake is also associated with a number of additional health benefits, including improved digestive function and a more favorable cardiovascular profile. For additional information regarding fiber and longevity, please refer to the article titled fiber and longevity.
Increase lean protein intake
Protein promotes satiety and can make managing hunger and calorie intake easier during a weight loss regimen. Additionally, protein is beneficial in preserving lean mass during a calorie deficit. A commonly cited target for daily protein intake is approximately 1.2g/kg of ideal body weight. This is not universally applicable; however, it is a reasonable starting point for many adults seeking to lose weight and maintain muscle. For further information on optimal protein intake, please refer to the article titled high protein diets: are they healthy or harmful.
Reduce ultra-processed foods and added sugars
Reducing your consumption of ultra-processed foods and added sugars is perhaps the easiest strategy for decreasing your overall caloric intake without keeping track of every food item. Ultra-processed foods are easily overconsumed. Additionally, sugary drinks are particularly detrimental, as they provide calories without promoting satiety.
Do not ignore exercise
Regular physical activity will improve your insulin sensitivity, even if you do not lose a large amount of weight. Regular physical activity will also help you preserve muscle during a weight loss program and improve your cardiovascular fitness, which is beneficial independent of glucose regulation. A practical starting point for engaging in regular physical activity may include incorporating exercise snacks and short bursts of physical activity.
When medication becomes part of the plan
Some people do the right things with diet and exercise and still struggle to reach weight loss targets or improve glycemic control.
In those cases, anti-obesity drugs such as GLP-1-based agents can be considered as part of a plan to help improve metabolic function. These medications can be highly effective for improving weight and blood sugar outcomes. Newer agents that combine GLP-1 with GIP signaling can produce even greater effects in some individuals. For more context, please refer to the emerging science around GLP-1 use.
Practical takeaways
- Weight loss has the strongest link to improving insulin sensitivity
- Weight loss is especially associated with reducing visceral fat and insulin resistance
- Different diet patterns have similar effects on reducing visceral fat when calories are controlled
- The most important factor for weight loss is maintaining a sustained calorie deficit
- Long-term adherence matters more than diet labeling
- Increasing fiber intake and lean protein can help maintain a calorie deficit long enough to lose meaningful weight
- Regular exercise increases insulin sensitivity and supports long-term health
- Medication may be appropriate if lifestyle changes do not result in enough improvement
Summary
Ultimately the best diet to improve insulin sensitivity is usually not going to be the most extreme or trendy one. The best diet will likely be the one that you can follow consistently while creating a sufficient calorie deficit for long enough to lose significant amounts of weight, particularly visceral fat.
By focusing on a few high leverage principles such as higher fiber intake when tolerated, adequate protein, less ultra processed foods, and regular movement you can improve your body's insulin sensitivity without having to create an overly complicated dietary identity. Medication can be added if needed but ultimately the foundation will remain a diet that works for your life, not just a piece of paper. This also fits the broader framework in healthy eating made simple.