Food Database
Insulin Index of Nuts and Seeds
Why almost every nut and seed ranks among the best foods for insulin control — and how to use this knowledge to build smarter, lower-insulin eating patterns.
What is the Insulin Index?
The Insulin Index (II) measures how much insulin your pancreas secretes in the two hours after eating a fixed 1,000 kJ (239 kcal) serving of a given food. Unlike the Glycemic Index — which only tracks blood glucose — the Insulin Index captures the full insulin response, including the non-glucose triggers: dietary protein, certain fats, and food processing.
Reference point
White bread = 100 (reference food)
All values in this database are expressed relative to white bread. A score of 20 means the food triggers roughly 20% of the insulin response that the same caloric amount of white bread would produce.
The scale was developed by Dr. Susanna Holt at the University of Sydney in 1997 and has since been validated across multiple clinical studies. For people managing type 2 diabetes, insulin resistance, or metabolic syndrome, the Insulin Index offers actionable precision that the Glycemic Index alone cannot provide.
≤ 39 Low
40–59 Moderate
≥ 60 High
InsulinGuru classification. Low II foods are the cornerstone of insulin-friendly eating.
Why Nuts and Seeds Score So Low
Nuts and seeds are among the most consistently low-II foods in the entire database. Three structural reasons explain why:
🥜 High Healthy Fat Content
- Dominated by monounsaturated & polyunsaturated fats
- Fat has minimal direct insulin-stimulating effect
- Slows gastric emptying, dampening any glucose spike
🌾 Low Digestible Carbohydrate
- Most nuts contain under 5 g net carbs per 30 g serving
- High fibre content further blunts post-meal glycaemia
- Very little starch to break down into glucose
🔬 Moderate Plant Protein
- Plant proteins are less insulinogenic than dairy or whey
- Amino acid profile causes a slow, blunted insulin rise
- No leucine-rich spike typical of animal protein
🧱 Food Matrix Effect
- Cell-wall structures in whole nuts trap fat & starch
- Hard matrix slows digestion significantly
- Processing (grinding, roasting) can slightly raise the II
Full Insulin Index Table — Nuts & Seeds
The table below includes 15 nuts and seeds with their Insulin Index scores, relative visual bar, category classification, and a brief note on key nutritional drivers. Scores are based on published research and adjusted to the InsulinGuru reference scale (white bread = 100).
* II scores are expressed relative to white bread (II = 100). Values are calibrated from published research and adjusted for InsulinGuru's reference scale. Individual responses may vary by 10–15% depending on ripeness, roasting level, and individual metabolic status.
Best & Worst Picks at a Glance
10
Lowest II in the category
Pecan, Macadamia, Brazil Nut
19
Average II across all 15 nuts & seeds listed
35
Highest II in the category
Sunflower Seeds
✓ Best choices
Lowest Insulin Impact
- Pecan — II 10, almost zero net carbs
- Macadamia — II 10, highest MUFA content
- Brazil Nut — II 10, selenium powerhouse
- Hazelnut — II 15, great for snacking
- Walnut — II 20, best omega-3 source
Use in moderation
Slightly Higher Insulin Impact
- Sunflower Seeds — II 35, higher carb ratio
- Peanut Butter — II 30, watch added sugar
- Chia Seeds — II 25, still excellent overall
- Cashew — II 22, highest starch of tree nuts
⚠ Watch out for
Flavoured, coated, and sweetened nuts. Honey-roasted, chocolate-covered, or yogurt-dipped versions can push the Insulin Index dramatically higher — in some cases to 60–80+ — due to added sugars and refined starches. Always check the label and prefer raw or dry-roasted varieties with no added sugar.
Practical Use: Low-II Meal Ideas with Nuts & Seeds
Knowing the numbers is only half the job. Here's how to build low-insulin meals that incorporate nuts and seeds strategically throughout the day.
Chia Overnight Oats
Steel-cut oats · 2 tbsp chia seeds · unsweetened almond milk · walnut halves · cinnamon
Est. II ≈ 35–45 Mixed Nut Snack Box
Pecan · macadamia · brazil nut · hazelnut · 1 square dark chocolate (≥85%)
Est. II ≈ 12–18 Almond-Crusted Salmon Salad
Leafy greens · baked salmon · crushed almonds · pumpkin seeds · olive oil & lemon
Est. II ≈ 25–35 💡 Pro tip
Adding nuts or seeds to a higher-II meal (like a bowl of oatmeal or a piece of fruit) acts as an insulin
buffer. The fat and fibre slow gastric emptying and blunt the post-meal insulin spike of the entire meal — not just the nuts themselves.
Portion Size Matters — Even with Low-II Foods
The Insulin Index is calibrated to a fixed caloric serving (1,000 kJ). Because nuts are calorie-dense, eating a large volume can still produce a meaningful cumulative insulin response — and add significant calories to your day.
A standard snack portion of nuts (28–30 g) falls well within a low-II threshold for all varieties listed. The key risk is mindless eating — consuming 100–150 g in one sitting, which multiplies the caloric load (and therefore the absolute insulin demand) significantly. Use a small bowl, not the whole bag.
Frequently Asked Questions
Are nuts safe for people with type 2 diabetes?
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Yes — nuts are consistently identified as among the most diabetes-friendly foods available. Their combination of low glycemic index, low Insulin Index, and anti-inflammatory fats makes them a protective dietary component. Multiple large studies, including the PREDIMED trial, found that nut-rich diets significantly reduced cardiovascular events in people with type 2 diabetes. Always prefer unsalted, unroasted varieties and respect portion sizes.
Does roasting nuts change their Insulin Index?
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Roasting has a modest effect. Light dry-roasting (without oil or sugar) may slightly increase the II by breaking down cell-wall matrices, making fat and starch slightly more digestible. However, the difference is small — typically 2–5 points. The bigger risk is flavoured roasted nuts with added honey, maple syrup, or sugar coatings, which can dramatically raise the II. Plain dry-roasted is still an excellent choice.
Which nut is best for lowering insulin resistance?
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No single nut is definitively "best," but walnuts have the strongest overall evidence for improving insulin sensitivity — largely due to their high ALA (omega-3) content and unique polyphenol profile. Almonds have the most evidence for reducing post-meal glucose spikes. For the lowest absolute insulin response, pecans and macadamia nuts score best. The ideal approach is variety.
Is peanut butter a good choice on a low-insulin diet?
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Natural peanut butter (ingredients: peanuts, salt only) has an II of approximately 30 — still firmly in the low range. The concern with commercial peanut butters is added sugars and hydrogenated oils, which raise the II and deliver trans fats. "Reduced fat" peanut butters are often worse — the fat is replaced with sugar. Look for natural or "old-fashioned" style; the oil will separate naturally, which is a sign of minimal processing.
Can eating too many nuts raise insulin?
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While the II score of nuts remains low regardless of serving size, the total insulin demand scales with caloric load. Eating 200 g of almonds (roughly 1,100 kcal) will produce a far larger absolute insulin response than a 30 g portion, even if the II score is the same. Additionally, chronic caloric excess from any food source — including nuts — can worsen insulin resistance over time through body fat accumulation. Stick to 30–50 g per snack sitting.
How do seeds compare to nuts for insulin management?
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Seeds have a slightly higher average II than tree nuts (approximately 24 vs. 17) mainly because of higher protein and carbohydrate ratios. However, seeds offer unique benefits: chia and flax seeds contain exceptional amounts of soluble fibre and omega-3 fatty acids, which actively improve insulin sensitivity over time. For people managing insulin resistance, including both nuts and seeds in the daily diet is the optimal strategy.
Key Takeaways
🥇
All 15 nuts & seeds are low-to-moderate II
No nut or seed in our database reaches a high II score. Even the highest-scoring item, sunflower seeds at II 35, remains well below the moderate threshold.
🔬
Fat content is the primary II driver
The more dominant the fat profile of a nut, the lower its Insulin Index. Pecans, macadamias, and Brazil nuts top the list for this reason.
🌱
Seeds excel in fibre & omega-3
Chia and flax seeds have a slightly higher II than the best tree nuts but deliver extraordinary fibre and ALA content that improves long-term insulin sensitivity.
⚠️
Processing raises the II significantly
Honey-roasted, sugar-coated, and flavoured nuts can double or triple the insulin response. Choose raw or plain dry-roasted; read labels carefully.
🍽️
Nuts buffer high-II meals
Adding a handful of nuts to a higher-carb meal slows gastric emptying and blunts the overall meal's insulin response — a powerful and practical strategy.
⚖️
Portion control still matters
A standard 28–30 g serving keeps insulin impact minimal. Eating 100–200 g in one sitting significantly increases the absolute insulin demand regardless of the low II score.
✅ Bottom line
Nuts and seeds are among the most consistently insulin-friendly foods in existence. A daily intake of 30–50 g of mixed, minimally processed nuts and seeds supports healthy insulin levels, reduces cardiovascular risk, and provides essential micronutrients — making them a cornerstone of any low-insulin dietary pattern.
