Insulin Index of Meat & Offal — InsulinGuru
Insulin Index

Insulin Index of Meat, Poultry & Offal

A complete guide to how different meats — from chicken breast to pork liver — trigger insulin release, with practical tables and meal-planning advice.

IG
InsulinGuru Research Team
Updated April 2026
| 12 min read |
Evidence-based

What is the insulin index?

The insulin index (II) measures how much a standard 1,000 kJ (240 kcal) portion of a food raises blood insulin over a two-hour window, benchmarked against white bread at 100. It was originally developed by Susanna Holt and colleagues at the University of Sydney, and it frequently surprises people — many high-protein, zero-carbohydrate foods still produce meaningful insulin responses.

How to read the scale
1–40Low
41–60Moderate
61–100+High

White bread = 100 (reference). Most fresh meats fall in the moderate range (40–55), well below grains, starchy foods, and sweets.

The glycemic index (GI) only tracks glucose, so it scores meat and eggs at zero — which is technically correct for blood glucose but misleading for anyone managing insulin levels. The insulin index tells a more complete story.

Why does protein-rich meat still trigger insulin?

Insulin has two jobs that go beyond glucose management. It acts as an anabolic hormone — directing amino acids from digested protein into muscle cells. When you eat a meat-heavy meal, the pancreas releases insulin to facilitate this amino acid uptake even in the near-total absence of carbohydrates.

Several factors modulate exactly how much insulin is triggered:

  • Amino acid profile — Leucine, lysine, and arginine are the strongest insulin secretagogues. Meats high in these amino acids (e.g., beef, chicken breast) score slightly higher than fatty cuts where protein is diluted by fat.
  • Fat content — Dietary fat slows gastric emptying and blunts the incretin response, so fattier cuts tend to have a modestly lower II.
  • Processing — Curing, smoking, and adding fillers (starch, sugars) can dramatically alter the II, especially in products like chicken nuggets or some commercial sausages.
  • Cooking method — High-heat cooking (grilling, frying) may generate Maillard compounds that slightly affect digestion rate, though the effect on insulin is small for plain meats.

Insulin index of fresh & whole cuts

The table below covers the most commonly consumed whole-muscle meats. Values are for plain, unseasoned, cooked portions with no added carbohydrates or sauces.

Beef, Pork, Lamb & Other Red Meats per 1,000 kJ serving, white bread = 100
Food II Score Visual Category Notes
Beef (lean, cooked) 51
Moderate Sirloin, rump, mince
Pork (lean, cooked) 45
Low–Mod Loin, tenderloin
Lamb 50
Moderate Leg, shoulder
Rabbit 45
Low–Mod Very lean; high protein
Duck (whole, skin-on) 55
Moderate Higher fat raises score slightly
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Important

What you eat alongside meat matters enormously — the side dish or vegetables you choose all contribute to the overall insulin load of your meal. You can read more about insulin load here.

Insulin index of poultry

Chicken and turkey are among the most popular proteins worldwide, partly because they are perceived as "diet-friendly." From an insulin index perspective, that reputation is justified — but the method of preparation matters enormously.

Poultry — Plain vs. Processed per 1,000 kJ serving
Food II Score Visual Category Notes
Turkey (roasted, no skin) 50
Moderate Breast or thigh, plain
Chicken breast (cooked) 49
Moderate Boneless, skinless
Chicken (whole, with skin) 49
Moderate Roasted, skin-on
Chicken nuggets ⚠ Processed 70
High Breadcrumbs + starches
Watch out
Chicken nuggets score 70 — 43% higher than a plain chicken breast. The dramatic difference comes from wheat-based breadcrumbs, modified starch binders, and often added sugars in the seasoning mix. Even "healthier" oven-baked nuggets carry a similar score if the breading is present.
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Insulin index of offal & organ meats

Offal — liver, hearts, gizzards — is one of the most nutrient-dense food categories on earth, and it also happens to produce among the lowest insulin responses of any animal protein. This is likely due to a combination of high fat content (especially in liver), a distinct amino acid profile, and the presence of compounds like heme iron and CoQ10 that influence metabolic signalling.

Organ Meats & Offal per 1,000 kJ serving
Food II Score Visual Category Notes
Chicken liver 19
Low Rich in fat + micronutrients
Chicken hearts 19
Low Dense protein + CoQ10
Chicken gizzards 19
Low Lean; high collagen
Pork liver 20
Low High vitamin A & B12
"Organ meats, such as chicken liver, are among the most nutrient-dense foods. They provide high amounts of bioavailable iron, vitamin B12, and other essential micronutrients. Compared to many foods, they contain little to no carbohydrates, but like other protein-rich foods, they can still stimulate a moderate insulin response. For people with insulin resistance, organ meats can be a nutritious option as part of a balanced low insulin diet."

An insulin index of 19–20 means organ meats trigger roughly 80% less insulin than white bread on a calorie-equivalent basis. This makes them exceptionally useful in low-insulin dietary protocols, carnivore-style diets, or simply as nutrient-dense additions to mixed meals.

Nutritional note
While the low II of organ meats is remarkable, liver is also extremely rich in vitamin A (retinol). Consumption of more than 100–150 g of liver per week is not recommended for pregnant women due to the risk of vitamin A toxicity. For all other adults, 1–2 servings per week is considered safe and beneficial.

Insulin index of processed & cured meats

Processing transforms meat's insulin response in complex ways. Salt-curing alone has minimal effect, but added sugars, starchy fillers, and coating agents can significantly raise the II. Conversely, traditional dry-curing methods (as used for jamon and Parma ham) preserve the low-to-moderate II of the original meat.

Processed, Cured & Deli Meats per 1,000 kJ serving
Food II Score Visual Category Notes
Jamon Ibérico / Serrano 40
Low–Mod Traditional dry-cure, no fillers
Parma ham (Prosciutto) 50
Moderate Air-dried, salt-only cure
Ham (cooked / sliced) 46
Moderate Check label for added sugars
Sausage (pork/beef) 28
Low High fat dilutes protein signal

Why does traditional sausage score so low?

Traditional pork-and-beef sausages (think bratwurst, Italian sausage, or a classic British banger with minimal rusk) score just 28 — lower than plain roast pork. The high fat content (often 25–35% of weight) slows gastric emptying, blunts GIP and GLP-1 secretion, and dilutes the relative proportion of insulin-stimulating amino acids per calorie. However, heavily processed mass-market sausages with added starch, glucose syrup, or cereal fillers can score significantly higher — always check the ingredient list.

Label check
Look for these ingredients that raise the insulin index of processed meats: maltodextrin, corn syrup, dextrose, modified starch, breadcrumbs, wheat flour. A clean cured or fermented meat product should list only meat, salt, and spices.
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How meat compares to other food groups

To put meat's II values in context, here's how they stack up against common food categories:

Food Category Comparison Average II by food group, white bread = 100
Food Category Typical II Range Visual
Organ meats (liver, heart) 19–20
Homemade sausage / fatty meats 28–35
Fresh lean meats 45–55
Fish & seafood 43–59
Eggs 31
Legumes (beans, lentils) 40–60
White rice / pasta 67–80
White bread 100
Chicken nuggets 70

The data makes a clear case: fresh, minimally processed meats are among the lowest insulin-stimulating protein sources available, comparable to eggs and fish. The only outlier within the meat category is heavily processed products like breaded chicken.

Practical meal planning with meat

Understanding insulin index values is only useful if they inform what you actually eat. Below are three example meals centred on meat that keep the overall meal II low, using protein-fat-fibre combinations proven to blunt post-meal insulin spikes.

Meal Option 1
Grilled Chicken & Avocado
Chicken breast · ½ avocado · mixed greens · olive oil dressing
Est. meal II ≈ 35
Meal Option 2
Pan-fried Chicken Livers
Chicken livers · butter · garlic · steamed broccoli
Est. meal II ≈ 22
Meal Option 3
Roast Lamb with Root Veg
Lamb leg · roasted carrots · courgette · rosemary
Est. meal II ≈ 48

Strategies to lower the meal insulin index

Lower II approach

Smart combinations

  • Add healthy fats — olive oil, butter, avocado slow digestion
  • Non-starchy vegetables — broccoli, courgette, spinach
  • Avoid breading/sauces — skip flour coatings and sugary glazes
  • Choose organ meats — once or twice weekly for II 19–20
  • Fermented sides — sauerkraut, kimchi lower glycaemic load

Common mistakes

  • Breaded chicken — II jumps from 49 → 70+
  • Sweet marinades — honey, teriyaki, BBQ sauce add fast carbs
  • Processed sausages — starch fillers quietly raise the II
  • Eating meat with bread — the bread dominates the combined II
  • Large portions of duck — high fat is good, but calorie density matters

Frequently asked questions

Does cooking method change the insulin index of meat? +
For plain, uncoated meat, the cooking method has a minimal effect on the insulin index. Grilling, roasting, poaching, and frying all produce similar II values. The major variable is what you add to the meat — breadcrumbs, sauces, marinades, or batters — not the cooking temperature itself. The Maillard reaction (browning) creates new compounds but doesn't meaningfully shift insulin secretion.
Is beef or chicken better for insulin management? +
Both are excellent choices. Chicken breast scores 49 and beef scores 51 — a difference too small to be clinically meaningful. More important is what you pair them with. A chicken breast served with white rice will spike insulin far more than a beef steak served with green vegetables, despite the steak's marginally higher solo II score.
Can I eat meat freely on a low-insulin diet? +
Fresh, minimally processed meat is one of the most insulin-friendly food groups available. That said, "freely" depends on your overall calorie goals and metabolic health. Very large protein meals (e.g., 500+ g of lean chicken) will produce a substantial insulin response even from a low-II food simply because of the total amino acid load. Moderate, balanced portions — typically 120–200 g of cooked meat per meal — are recommended for most adults.
Why is the insulin index of sausage lower than chicken breast? +
Traditional sausage has a much higher fat content (often 25–35%) than skinless chicken breast (3–5%). Dietary fat slows gastric emptying and reduces the incretin hormone response, which in turn blunts insulin secretion. Per 1,000 kJ (the standardised serving used for II measurement), you are consuming relatively fewer amino acids in sausage and more fat, which drives the II down to around 28. Note: this does not mean sausage is healthier overall — its saturated fat and sodium content bring separate considerations.
Are organ meats safe to eat regularly? +
Yes, for most people. Organ meats are extraordinarily nutrient-dense and have a very low insulin index (19–20). One to two servings per week is widely recommended. The main caution is liver: it contains very high concentrations of retinol (vitamin A), which can accumulate to toxic levels if eaten daily in large quantities. Pregnant women are advised to limit liver consumption or avoid it entirely due to this risk. Hearts and gizzards do not carry the same restriction.
How does jamon compare to regular ham? +
Jamon (Ibérico or Serrano) scores 40, noticeably lower than regular cooked ham (46) or even Parma ham (50). Traditional Spanish dry-curing uses only salt, time, and air — no sugars, nitrate brines, or fillers. The extended curing also concentrates fat and changes the protein structure in ways that moderate the insulin response. If you enjoy cured meats, Jamon Ibérico is arguably the best choice from an insulin index perspective, and it also contains oleic acid (the same monounsaturated fat found in olive oil) due to the acorn-fed diet of Ibérico pigs.

Key takeaways

🥩
Fresh meats are insulin-friendly All plain, whole-muscle meats score 45–55 — about half the II of white bread.
🫀
Organ meats are exceptional Chicken liver, hearts, and pork liver score just 19–20 — the lowest of any common protein food.
⚠️
Processing is the danger Chicken nuggets score 70 — 43% more than plain chicken — due to breadcrumb coatings and starch binders.
🥓
Fat dilutes the insulin signal Traditional sausage (II 28) and jamon (II 40) score lower because fat content blunts the amino acid-insulin response.
🥗
Pairings matter more than choice Serving meat with non-starchy vegetables and healthy fats keeps the meal II lower than the meat's individual score.
🔖
Read labels on processed meats Look for starch, dextrose, or glucose syrup in ingredient lists — reliable signs of a higher II product.

References & Further Reading

  1. Holt SHA, Brand-Miller JC, Petocz P. An insulin index of foods: the insulin demand generated by 1000-kJ portions of common foods. Am J Clin Nutr. 1997;66(5):1264–1276.
  2. Nuttall FQ, Gannon MC. Plasma glucose and insulin response to macronutrients in nondiabetic and NIDDM subjects. Diabetes Care. 1991;14(9):824–838.
  3. Tremblay F, Lavigne C, Jacques H, Marette A. Role of dietary proteins and amino acids in the pathogenesis of insulin resistance. Annu Rev Nutr. 2007;27:293–310.
  4. Hermansen K, Søndergaard M, Høie L, Carstensen M, Brock B. Beneficial effects of a high-protein diet on glucose levels, insulin sensitivity and lipid profiles in type 2 diabetics. Eur J Clin Nutr. 2007;61(4):523–529.
  5. Bodinham CL, Smith L, Thomas EL, et al. Dietary protein and muscle protein synthesis in older adults. Nutr Metab. 2014;11:10.
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