If you have been told that you are insulin resistant, carbohydrates can quickly start to look like the problem.
There is a reason for that. Carbohydrate-containing foods have the most immediate effect on blood glucose after eating, and insulin helps the body manage that glucose. Eating less carbohydrate can reduce the glucose load after a meal and can improve glycemic control for some people.
What follows is less straightforward. Insulin resistance is influenced by far more than the amount of carbohydrate on your plate, and research does not support one ideal carbohydrate intake for everyone.
For most people, the useful decision is not whether carbohydrates should disappear. It is which carbohydrate foods are worth eating, how much suits their circumstances, and whether reducing the overall amount provides an additional benefit.
What insulin resistance actually means
Insulin is a hormone produced by the pancreas. Among its jobs is helping regulate blood glucose by allowing tissues such as muscle to take up and use glucose.
With insulin resistance, cells respond less effectively to insulin. The body may compensate by producing more of it. Over time, this can contribute to higher blood glucose and increase the likelihood of developing prediabetes or type 2 diabetes.
Many things can influence this process. Excess body fat, particularly around abdominal organs, physical inactivity, genetics, sleep, ageing, certain medications and some medical conditions can all contribute. Carbohydrate intake sits within that larger metabolic picture.
What happens when people eat fewer carbohydrates?
The strongest evidence comes from people who already have type 2 diabetes.
A 2025 systematic review and meta-analysis brought together 27 randomized controlled trials involving 2,870 adults with type 2 diabetes. Lower-carbohydrate diets produced a modest improvement in glycemic control, with HbA1c about 0.29 percentage points lower across the analysed time points. The largest difference appeared at three months, and the benefits diminished over time.
That distinction matters. These trials mainly tell us about glycemic control in people with diagnosed type 2 diabetes. They do not establish that cutting carbohydrate by the same amount will improve directly measured insulin sensitivity in everyone with insulin resistance, prediabetes or otherwise normal glucose levels. Evidence using measures such as fasting insulin and HOMA-IR is thinner and less consistent.
So there is a real signal here, but a fairly specific one: lowering carbohydrate can be useful for glycemic management in some people with type 2 diabetes, especially over shorter periods. It is not evidence that carbohydrate elimination is required to “reverse” insulin resistance.
How low does carbohydrate need to go?
There is no single answer.
Reducing carbohydrate might mean dropping a daily sugary drink, making a portion of rice smaller or replacing some refined snacks with foods containing more protein or fibre. At the other end of the spectrum are very-low-carbohydrate and ketogenic diets.
Those are substantially different dietary changes.
Current diabetes nutrition guidance does not prescribe one ideal percentage of calories from carbohydrate, protein and fat for everyone. It recognizes several dietary patterns and recommends individualizing them according to metabolic goals, food preferences and health circumstances.
Someone can therefore reduce carbohydrate meaningfully without approaching a ketogenic diet.
The food carrying the carbohydrate matters
Compare lentils, an apple and a bottle of sugary soft drink. All provide carbohydrate, but they arrive with very different nutritional packages.
Legumes, whole fruit, vegetables and whole grains can contribute fibre, vitamins, minerals and other useful nutrients. Sugary drinks, sweets and many highly refined snack foods offer a different combination, often with much less fibre and less satiety.
Higher-fibre diets have improved measures such as HbA1c and fasting glucose in trials involving people with diabetes, although the size of the effect varies. Whole-grain research also suggests potential metabolic benefits, with results differing across studies and outcomes.
This is one reason carbohydrate grams alone provide an incomplete picture of a meal.
For someone whose day regularly includes sweetened cereal, a large refined-flour lunch, biscuits in the afternoon and a sugary drink with dinner, useful changes do not require removing every carbohydrate-containing food. A higher-fibre breakfast, water instead of the sugary drink, a different snack and a more balanced lunch would change both carbohydrate quality and, quite possibly, the total amount eaten.
Fruit, legumes or whole grains could still remain part of that person’s diet.
Different eating patterns can work
Mediterranean-style, DASH, plant-forward and lower-carbohydrate approaches can all be built around nutritious, minimally processed foods. Diabetes-prevention and diabetes-management guidance recognizes more than one workable dietary pattern.
What someone eats in place of carbohydrate is therefore important. A lower-carbohydrate diet built around vegetables, nuts, seeds, fish, olive oil and other nutrient-dense foods is nutritionally different from one dominated by foods high in saturated fat.
Very-low-carbohydrate and ketogenic diets can also affect blood lipids differently between individuals. Recent trial evidence suggests LDL cholesterol can rise in some people, even while triglycerides fall and HDL cholesterol rises. Anyone following such a pattern over time has a reason to pay attention to their lipid results rather than assuming that every cardiovascular marker will move in the same direction.
Reducing carbohydrate can also make it harder to obtain enough fibre if fibre-rich foods are removed without suitable replacements. That is a reason to think about what remains on the plate, not simply what has been taken away.
Where weight loss fits
For someone carrying excess body fat, losing weight can improve glucose regulation and insulin sensitivity. That can happen with different macronutrient patterns.
A lower-carbohydrate approach may make eating less energy easier for one person. Someone else may find a Mediterranean-style or more balanced pattern easier to sustain. In diet trials, changes in body weight, calorie intake, protein, fat, fibre and food quality frequently occur together, which makes it difficult to attribute every metabolic change to carbohydrate alone.
This is especially relevant when comparing diets over many months. The initial difference between dietary approaches often becomes smaller as adherence changes and weight-loss differences narrow.
Movement gives you another metabolic lever
Skeletal muscle is a major site for glucose disposal. Physical activity can increase glucose uptake and improve insulin sensitivity, and both aerobic activity and resistance training contribute to metabolic health.
Even relatively modest movement after eating can reduce post-meal glucose exposure in some circumstances. A person’s activity level can therefore influence how the body handles the carbohydrate they eat.
Diet remains important, but insulin resistance is not solely a food problem. Regular movement, resistance training, sleep and changes in body composition where appropriate can all influence the same metabolic system.
What about fruit, bread, rice and potatoes?
These foods are often swept into the same “carb” category even though their nutritional characteristics and the way people eat them vary considerably.
Whole fruit provides naturally occurring sugars alongside fibre, water and micronutrients, and current diabetes guidance includes it among nutrient-dense foods. Someone actively managing diabetes may still need to consider portions and their individual glucose response, but whole fruit should not be treated as nutritionally equivalent to a sugary drink.
Bread, rice and potatoes require more context. Portion size, degree of processing, what accompanies them in the meal and the person’s metabolic circumstances can all matter. Someone eating large portions of refined starch at most meals may have good reason to reduce those portions or choose higher-fibre alternatives. Someone already eating moderate portions within a varied diet may have much less to gain from removing them.
Looking at the meal usually tells you more than labelling an individual food “good” or “bad.”
When choosing lower carbohydrate makes sense
Some people prefer eating fewer carbohydrates. They may find it easier to manage appetite, structure meals or control blood glucose that way. For people with type 2 diabetes, evidence supports lower-carbohydrate eating as one legitimate option for improving glycemic control, particularly in the shorter term.
A workable version still needs enough nutritional quality to survive beyond the label. Fibre needs attention. So do the types of fat and protein replacing carbohydrate, the person’s lipid response, cultural and food preferences, medication use and whether the pattern remains realistic months later.
For someone with a history of disordered eating or highly restrictive dieting, deliberately tightening food rules may carry its own cost. In that situation, dietary changes are better approached with appropriate professional support than through increasingly rigid restriction.
Medication changes need planning
A major reduction in carbohydrate intake can alter glucose levels quickly enough to affect medication requirements.
This matters especially for people using insulin or sulfonylureas, which carry a meaningful risk of hypoglycemia. Doses may need to be adjusted in advance with the clinician responsible for diabetes treatment rather than waiting for low blood glucose to occur. In some people, improved glycemic control can allow medication to be reduced, but that adjustment should be managed deliberately. Current ADA guidance identifies insulin and sulfonylureas among therapies with higher hypoglycemia risk.
SGLT2 inhibitors require a different warning. Very-low-carbohydrate or ketogenic eating patterns can increase the risk of ketoacidosis in people taking these medications. That concern also matters when SGLT2 inhibitors are prescribed for conditions such as heart failure or chronic kidney disease in people who do not have diabetes. Current ADA guidance identifies very-low-carbohydrate eating among the risk factors for SGLT inhibitor-associated ketoacidosis.
Anyone taking glucose-lowering medication or an SGLT2 inhibitor should therefore discuss a substantial carbohydrate reduction with the clinician managing that treatment before making the change.
A practical place to start
Before deciding that you need a low-carbohydrate diet, look at where carbohydrate currently enters your day.
Sugar-sweetened drinks, sweets and heavily refined snacks are obvious places to examine. Large portions of refined starch may be another. Reducing those foods can lower carbohydrate intake while improving the overall quality of the diet.
Then look at what replaces them. A meal with vegetables, a useful source of protein and fibre-rich foods may still contain fruit, beans, whole grains or a moderate portion of another carbohydrate food.
After that, the amount can be adjusted according to appetite, activity, glucose response, health goals and personal preference. Some people will feel and function well with substantially less carbohydrate. Others may achieve their metabolic goals without adopting a low-carbohydrate diet at all.
The bottom line
You do not need to eliminate carbohydrates simply because you have insulin resistance.
Lower-carbohydrate diets can produce modest improvements in glycemic control for people with type 2 diabetes, with the clearest benefits appearing in the shorter term and tending to diminish over longer follow-up. That evidence should not be stretched into proof that everyone with insulin resistance needs carbohydrate restriction.
For most people, there is value in examining carbohydrate quality first: fewer sugary drinks and highly refined foods, more fibre-rich foods, and portions that fit the rest of the meal and the person’s metabolic circumstances.
If further carbohydrate reduction helps and produces an eating pattern that is nutritious, medically appropriate and sustainable, it can be a reasonable choice. It is one option, not a requirement.
Sources & Further Reading
- 5. Facilitating Positive Health Behaviors and Well-being to Improve Health Outcomes: Standards of Care in Diabetes—2026 — American Diabetes Association Professional Practice Committee for Diabetes. Diabetes Care. 2026;49(Suppl 1):S89–S131.
- 3. Prevention or Delay of Diabetes and Associated Comorbidities: Standards of Care in Diabetes—2026 — American Diabetes Association Professional Practice Committee for Diabetes. Diabetes Care. 2026;49(Suppl 1).
- Effectiveness of low-carbohydrate diets on type 2 diabetes: A systematic review and meta-analysis of randomized controlled trials in Eastern vs. Western populations — 27 randomized controlled trials; 2,870 participants. 2025.
- Dose-dependent effect of carbohydrate restriction for type 2 diabetes management: a systematic review and dose-response meta-analysis of randomized controlled trials — American Journal of Clinical Nutrition. 2022. PMID 35537861.
- Dietary fibre and whole grains in diabetes management: Systematic review and meta-analyses — Reynolds AN, Akerman AP, Mann J. PLOS Medicine. 2020;17(3):e1003053. DOI 10.1371/journal.pmed.1003053. PMID 32142510.
- Carbohydrate quality and human health: a series of systematic reviews and meta-analyses — Reynolds A, Mann J, Cummings J, Winter N, Mete E, Te Morenga L. The Lancet. 2019;393(10170):434–445.