Sleepiness that sets in an hour after lunch, a craving for sweets before four in the afternoon, being hungry again two hours after breakfast, fat around the waist that will not shift whatever you do… Many people living with this picture hear the same words at some point: insulin resistance. Seeing this phrase on a test result can be worrying; yet insulin resistance is one of the metabolic conditions that responds best to changes in diet and lifestyle.
On this page you will find what insulin resistance is, its symptoms, the basic principles of nutrition for insulin resistance, the most frequently asked questions such as snacks and intermittent fasting, and common mistakes.
What is insulin resistance?
Insulin is the hormone secreted by the pancreas that allows sugar in the blood to enter the cells. You can think of it as a key that opens the cell’s door. In insulin resistance the lock stiffens: muscle, liver and fat cells no longer respond to insulin as well as before. The pancreas then has to secrete more insulin to do the same job.
At this stage fasting blood sugar is usually within normal limits, because the pancreas makes up the difference by working harder. The problem is the insulin itself, which stays high in the blood for long periods: it makes fat storage easier, makes fat burning harder and causes swings in appetite. If this goes on for years, the pancreas tires, blood sugar begins to rise and the condition can progress to prediabetes and then type 2 diabetes. The good news is that this course can largely be changed in the early period.
What are the symptoms of insulin resistance?
Insulin resistance can progress for a long time without symptoms. Commonly described signs are:
- Sleepiness and tiredness after meals, especially carbohydrate-heavy ones
- Getting hungry quickly; shaky hands, irritability and headache when the gap between meals grows
- A strong desire for sweets or pastries in the afternoon and evening
- Fat around the waist and difficulty losing weight
- Darkening of the skin in folds such as the back of the neck, armpits and groin
- In women, irregular periods, excess hair growth and acne; these may be seen together with polycystic ovary syndrome
None of these symptoms is enough for a diagnosis on its own. Sleepiness after meals may come from too little sleep, and a craving for sweets from an unbalanced meal. A definite assessment is made with tests.
How is insulin resistance diagnosed?
The diagnosis is made by a doctor. The assessment uses fasting blood sugar, fasting insulin and the HOMA-IR value calculated from the two, HbA1c, which shows the three-month average of blood sugar, and, where needed, an oral glucose tolerance test. The decision is not based on a single value; waist circumference, blood lipids, blood pressure, family history and symptoms are interpreted together.
The doctor also decides whether medication is needed. The dietitian’s job is to prepare a practical nutrition plan in line with this diagnosis and treatment. Whether or not medication is used, diet and physical activity are the foundation of treatment.
What should nutrition for insulin resistance look like?
Contrary to popular belief, an insulin resistance diet does not mean removing bread and fruit from your life. The goal is to prevent blood sugar from rising and falling sharply during the day and to lighten the load on the pancreas.
Adjusting the type and amount of carbohydrate, not cutting it out
White bread, white rice, pastries, sugary drinks and desserts are digested quickly and raise blood sugar fast. Wholegrain bread, bulgur, oats, pulses and vegetables are absorbed more slowly because they contain fibre. The portion matters as much as the type: even a healthy carbohydrate raises blood sugar when eaten in large amounts. Choosing whole fruit instead of fruit juice, and fruit with yoghurt or a handful of nuts rather than on its own, is a small but effective change.
Protein and fibre at every meal
Protein and fibre slow stomach emptying, prolong fullness and soften the rise in blood sugar after a meal. A breakfast of only a sesame bagel and tea does not leave you feeling the same by midday as one of eggs, cheese, plenty of greens and a slice of wholegrain bread. Eggs, yoghurt, cheese, meat, chicken, fish and pulses should appear in some form at every main meal.
Making room for healthy fats
Olive oil, walnuts, almonds, hazelnuts, avocado and oily fish make a meal more satisfying. Leaving the plate dry out of fear of fat usually ends in an urge to snack an hour later.
Meal pattern: are snacks essential?
For years everyone with insulin resistance was advised to eat three main meals and three snacks. Today we know that this is not necessary for everyone. Snacking frequently through the day means insulin is stimulated again each time. On the other hand, a planned snack is useful for people who become shaky and overeat when the gap between meals is too long. How many times you eat is decided individually according to your working hours, your hunger and the medicines you take.
The order in which you eat
Eating the same plate in a different order can change the blood sugar response after the meal. Starting with salad or vegetables, then the protein, and leaving the rice, pasta or bread until last slows the absorption of carbohydrate. We explain the details in the article on meal sequence and blood sugar.
Sugary drinks and packaged products
Sugar in liquid form is the source that raises blood sugar fastest. Fizzy drinks, ready-made fruit juices, sweetened coffees and energy drinks are the first things to give up. Products labelled “sugar-free” or “fit” may not be innocent either; the ingredients list and the portion need to be checked.
Habits beyond diet that affect insulin sensitivity
- Movement: Muscles are the biggest consumer of sugar in the blood. A ten- to fifteen-minute walk after a meal helps lower blood sugar after eating. Resistance exercise a few days a week supports insulin sensitivity by increasing muscle mass.
- Sleep: Even a few nights of too little sleep can reduce the cells’ response to insulin, and increases appetite and sweet cravings the next day.
- Stress: Long-lasting stress raises cortisol, and cortisol tends to increase blood sugar and fat around the abdomen.
- Body weight: In people who are overweight, losing even 5–10 per cent of body weight can bring a marked improvement in insulin sensitivity. The goal is not to reach an ideal weight as soon as possible but a sustainable loss. We cover this on the weight management page.
Does intermittent fasting help with insulin resistance?
Intermittent fasting may help some people by reducing total energy intake and ending night-time snacking. However, it is not suitable for everyone. It can be harmful for those who tend to overeat after long periods without food, those with a history of eating disorders, pregnant women and people taking medicines that lower blood sugar. Narrowing the hours in which you eat does not mean that what you eat in those hours stops mattering either. If you would like to try this method, you should plan it with your doctor and dietitian.
Common mistakes in insulin resistance
- Cutting carbohydrates to zero: The scales drop in the short term, but it cannot be sustained. When the restriction ends, people return to their old pattern, often with more.
- Banning fruit altogether: Fruit contains fibre, vitamins and water. The problem is not the fruit itself but the amount, turning it into juice and eating it alone.
- Building breakfast on carbohydrates: A breakfast of jam, honey, bagels, pastries and fruit juice sets the stage for waves of hunger for the rest of the day.
- Going hungry all day and loading up in the evening: Shifting the largest meal to late at night makes blood sugar control harder.
- Expecting a solution from apple cider vinegar, cinnamon or herbal supplements: These products do not take the place of a balanced diet, and some can interact with medicines.
- Relying on medication and not changing habits: Medication works together with diet and physical activity; it does not replace them.
When should you see a doctor?
Symptoms such as drinking a lot of water, passing urine often, unexplained weight loss, blurred vision, slow-healing wounds and numbness in the hands and feet may indicate raised blood sugar and need medical assessment without delay. People with type 2 diabetes in the family, those who had raised blood sugar in pregnancy or those diagnosed with polycystic ovary syndrome are advised to have regular check-ups.
Frequently asked questions
Does insulin resistance go away completely?
With diet, physical activity, sleep and, where needed, medication, insulin sensitivity can improve considerably and test values can return to the normal range. However, the picture can return if old habits come back; this is why the aim is a lasting routine rather than a temporary diet.
Can you eat fruit with insulin resistance?
Yes. The daily amount and timing are adjusted to the individual. Eating fruit whole and with a source of protein or fat such as yoghurt, milk or nuts softens the blood sugar response.
Do I have to give up bread, rice and pasta completely?
No. Choosing wholegrain options, adjusting the portion and eating these foods with vegetables and protein is enough for most people. Banning them completely is not sustainable in the long term.
Does insulin resistance make it harder to lose weight?
High insulin levels can make the process harder because they favour fat storage and cause swings in appetite, but they do not make weight loss impossible. As meal structure improves, hunger attacks decrease and the plan becomes workable.
I take medication. Do I still need to change my diet?
Yes. Medication supports the action of insulin, but it is not enough on its own unless the diet, inactivity and sleep patterns underlying insulin resistance change. Every decision about your medication is made by your doctor.
