What is the best diet for insulin resistance?

Key takeaways

• A balanced diet can support steadier blood glucose levels and help with weight loss.
• Weight loss and regular exercise are the most effective ways to improve, and even reverse, insulin resistance.
• A Mediterranean-style diet, rich in vegetables, wholegrains, fibre, healthy fats and protein, is recommended.
• Small changes to your eating habits can support your health over time — you don’t need to aim for perfection.
• If insulin resistance is making it harder to manage your weight, expert support from Oviva can help you build habits that fit into your life.

Can diet help insulin resistance?

Healthy eating plays an important role if you have insulin resistance, but not because it directly improves the condition. Instead, a balanced diet can help you manage your blood glucose levels.

Insulin carries glucose to your body’s cells, where it’s used for energy. Insulin is essentially the “key” that “unlocks” the cell so glucose can get in.

When you have insulin resistance, the “key” doesn’t “unlock” the cell as easily. This means glucose stays in your bloodstream for longer, so your body releases more insulin in an attempt to move it into your cells.

Eating a balanced diet can help keep your blood glucose levels steadier, meaning your body doesn’t need to produce large amounts of insulin.

The best diet for insulin resistance

Research suggests that a Mediterranean diet is one of the best diets to improve overall health and support healthy weight loss.

Rather than cutting out food groups, it focuses on eating plenty of:

• Vegetables
• Fruit
• Legumes
• Healthy fats
• Lean sources of protein

As well as fibre-rich carbohydrates in moderation

These foods are digested more slowly, helping to reduce large spikes in blood glucose after meals and lowering the amount of insulin your body needs to produce.

Which foods are recommended?

The best foods for insulin resistance are those that help keep your blood glucose levels steady.

In general, this means choosing foods that are rich in fibre, protein and healthy fats, as they are digested more slowly and help you feel fuller for longer.

Eat plenty of vegetables and fruit

Aim to fill half your plate with vegetables at meal times.

Find enjoyable ways to snack on fruit and vegetables too – for example, apple slices with peanut butter or carrot sticks with hummus.

Choose wholegrain carbohydrates

You don’t need to avoid carbohydrates if you have insulin resistance. Instead, choose wholegrain options, such as:

• Wholemeal bread
• Wholemeal pasta
• Brown rice
• Oats

These contain more fibre than refined carbohydrates and are broken down more slowly, helping to reduce blood glucose spikes after meals.

Include protein with every meal

Protein helps you stay fuller for longer and can slow the absorption of carbohydrates when eaten as part of a balanced meal. Good options include:

• Chicken and turkey
• Fish
• Eggs
• Greek or natural yoghurt
• Cottage cheese or quark
• Beans, lentils and chickpeas
• Tofu

Is glycaemic index (GI) important?

The glycaemic index (GI) measures how quickly carbohydrate-containing foods raise your blood glucose levels.

In general:

• Low-GI foods are digested more slowly, causing a steadier rise in blood glucose.
• High-GI foods are broken down more quickly, leading to a faster rise in blood glucose.

Lower-GI foods can help support healthy blood glucose levels, including:

• Vegetables
• Beans, lentils and chickpeas
• Oats
• Wholegrains
• Many fruits

But GI isn’t the whole story. Your blood glucose response also depends on things like:

• How much you eat
• What you eat alongside it

For example, pairing carbohydrates with protein, healthy fats or fibre can slow the release of glucose into your bloodstream.

The bottom line? You don’t need to memorise GI tables or avoid high-GI foods completely. Instead, focus on building balanced meals with plenty of whole, minimally processed foods. This is a simpler, more sustainable way to support healthy blood glucose levels and improve insulin resistance.

What foods should you limit?

No foods are completely off limits if you have insulin resistance.

However, having some foods less often can help support steadier blood glucose levels and improve insulin sensitivity over time.

Foods high in added sugar

These are digested quickly and can cause larger spikes in blood glucose. Try to have them less often, including:

• Sweets and confectionery
• Sugary drinks, energy drinks and sweetened coffee drinks
• Cakes, biscuits and pastries
• Jams and sweet spreads

Refined carbohydrates

Refined carbohydrates contain less fibre than wholegrain alternatives, meaning they’re broken down more quickly. Where possible, swap them for wholegrain options.

Foods to limit include:

• White bread, rolls and bagels
• White rice
• White pasta
• Sugary breakfast cereals

Ultra-processed foods

Many ultra-processed foods are high in refined carbohydrates, saturated fat, salt or added sugar.

These include:

• Crisps and other savoury snacks
• Fast food such as burgers, pizza and chips
• Processed meats, including sausages, bacon, salami and pâté

Foods high in saturated fat

Rather than cutting out fat altogether, try to replace saturated fats with healthier unsaturated fats, such as olive oil, nuts and seeds.

Foods to have less often include:

• Fatty cuts of meat
• Butter
• Cream
• Pastries and other foods made with butter or palm oil

You don’t need to eat perfectly to improve insulin resistance. The biggest benefits come from making small, realistic swaps when you can, rather than trying to avoid certain foods completely.