-What Foods Worsen Insulin Resistance?
Medically Reviewed by: Dr. Bradley DyerShort Answer
No single food causes insulin resistance on its own. However, a dietary pattern that repeatedly drives blood sugar and insulin higher can contribute to worsening insulin resistance over time.
The biggest concerns are typically added sugars, sugar-sweetened beverages, refined carbohydrates, and ultra-processed foods. For someone who already has significant insulin resistance, even higher-carbohydrate whole foods such as grains and starches may need to be reduced for a period of time.
At Premier Integrative Health, we use our KetoBiome approach to individualize carbohydrate intake based on a person's metabolic health, insulin sensitivity, and where they are in their health journey.
Foods That May Worsen Insulin Resistance
1. Sugar-Sweetened Beverages
Sugary beverages are one of the easiest ways to consume a large amount of sugar very quickly.
Examples include:
Regular soda
Sweet tea
Energy drinks
Fruit punch and many fruit drinks
Sweetened coffee beverages
Sports drinks with added sugar
Because these beverages contain rapidly absorbed carbohydrates and provide very little satiety, they can cause significant increases in blood glucose and insulin.
For someone with insulin resistance, reducing or eliminating sugar-sweetened beverages is often one of the most impactful nutritional changes they can make.
2. Refined Carbohydrates
Refined carbohydrates are broken down quickly into glucose and can cause rapid increases in both blood sugar and insulin.
Examples include:
White bread
Regular pasta
Crackers
Chips
Pastries
Many breakfast cereals
Foods made primarily from refined flour
Frequently consuming these foods can make blood sugar regulation more difficult, especially in someone who is already insulin resistant.
Importantly, simply replacing refined grains with whole grains is not always enough.
Whole grains may contain more fiber and nutrients, but they are still a significant source of carbohydrate. Depending on the degree of insulin resistance, it may be appropriate to reduce grains and starches more substantially while working to improve metabolic health.
3. Foods High in Added Sugar
Regularly consuming large amounts of added sugar can make it more difficult to regulate blood sugar, insulin, appetite, and body weight.
Common sources include:
Candy
Cookies
Cakes
Donuts
Ice cream
Sweetened breakfast cereals
Packaged desserts
Flavored yogurts and other foods with significant added sugar
Reading food labels can be helpful because added sugars are often present in foods that are marketed as healthy.
4. Ultra-Processed Foods
Ultra-processed foods are often particularly problematic because they combine several factors that can work against metabolic health.
They frequently contain:
Refined carbohydrates
Added sugars
Highly processed fats
Very little fiber
Relatively little protein
Ingredients designed to make the food highly palatable and easy to overeat
Examples include:
Chips
Snack cakes
Fast food
Packaged snack foods
Many frozen convenience meals
Highly processed breakfast foods
These foods often provide a large amount of energy without creating much fullness and can make maintaining healthy blood sugar and insulin levels more difficult.
What About Grains and Starches?
Not every person needs to eliminate grains or starchy foods.
However, we do not believe carbohydrate recommendations should be the same for everyone.
Someone with significant insulin resistance, prediabetes, elevated fasting insulin, or difficulty regulating blood sugar may benefit from a more substantial reduction in carbohydrate intake.
For that person, foods such as:
Bread
Rice
Pasta
Potatoes
Higher-carbohydrate grains
Other concentrated starches
may need to be limited for a period of time.
As insulin sensitivity and metabolic flexibility improve, some of these foods may be reintroduced depending on the individual's health, activity level, goals, and metabolic response.
The goal is not necessarily lifelong carbohydrate restriction.
The goal is to match carbohydrate intake to the individual's current metabolic health.
What Foods Support Better Insulin Sensitivity?
Rather than simply focusing on what to avoid, meals should be built around foods that support better blood sugar regulation and metabolic health.
The foundation of our KetoBiome approach includes:
High-quality protein
Non-starchy vegetables
A diverse variety of nutrient-dense and polyphenol-rich plants
Healthy fats such as extra virgin olive oil, avocado, nuts, and seeds
Minimally processed whole foods
Carbohydrates individualized to the person's metabolic needs
Protein is particularly important because it supports satiety and helps preserve or build skeletal muscle.
Muscle plays a major role in glucose disposal and insulin sensitivity, making adequate protein and resistance training important parts of improving metabolic health.
The KetoBiome Approach
At Premier Integrative Health, we use KetoBiome as a flexible nutritional framework rather than a rigid diet.
For someone with significant insulin resistance, KetoBiome may initially look more like a low-carbohydrate or ketogenic eating pattern.
As insulin sensitivity improves, the diet can often expand to include additional whole-food carbohydrates and may begin to look more Mediterranean in nature.
This flexibility allows nutrition to evolve as metabolic health improves.
The goal is to help restore metabolic flexibility, allowing the body to efficiently use both fat and glucose for energy.
It's About Your Overall Eating Pattern
One meal or occasional food choice does not determine your metabolic health.
What matters most is the pattern you follow consistently over time.
For someone with insulin resistance, that generally means reducing the foods that repeatedly drive blood sugar and insulin higher while emphasizing protein, nutrient-dense plants, healthy fats, and minimally processed foods.
The degree of carbohydrate restriction should be individualized rather than determined by a one-size-fits-all diet.
The Bottom Line
The foods most likely to worsen insulin resistance are added sugars, sugar-sweetened beverages, refined carbohydrates, and ultra-processed foods.
For someone who already has significant insulin resistance, higher-carbohydrate grains and starches may also need to be reduced while insulin sensitivity improves.
At Premier Integrative Health, our KetoBiome approach individualizes carbohydrate intake based on each person's metabolic health rather than automatically recommending the same diet for everyone.
Wondering how your diet is affecting your metabolic health? The team at Premier Integrative Health can evaluate your metabolic health and develop a personalized KetoBiome nutrition strategy designed to improve insulin sensitivity, blood sugar regulation, and long-term metabolic health.
