Chemistry:Fatty acid ratio in food

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Short description: Proportion of omega-3 to omega-6 fatty acids in a diet

Only two essential fatty acids are known to be essential for humans: alpha-linolenic acid (an omega−3 fatty acid) and linoleic acid (an omega−6 fatty acid).[1] Closely related, these fatty acids act as competing substrates for the same enzymes. The biological effects of the ω−3 and ω−6 fatty acids are largely mediated by essential fatty acid interactions. The proportion of omega−3 to omega−6 fatty acids in a diet may have metabolic consequences.[2] Unlike omega−3 fatty acids and omega−6 fatty acids, omega−9 fatty acids are not classed as essential fatty acids because they can be created by the human body from monounsaturated and saturated fatty acids, and are therefore not essential in the diet.

Ratio of omega−6 to omega−3 fats in the diets of hunter-gatherers

It has been claimed that among hunter-gatherer populations, omega−6 fats and omega−3 fats are typically consumed in roughly a 1:1 ratio.[3][4] At one extreme of the spectrum of hunter-gatherer diets, the Greenland Inuit, before the late 20th century, consumed a diet with twice as much omega−3 as omega−6, thanks to a diet rich in cold-water fish (a rich source of omega−3s) and completely devoid of omega−6-rich seed oils.[5]

Optimal ratio of omega−6 to omega−3 fats

The potential link between the dietary omega-6 to omega-3 ratio and human health was first noted in the late 1970s, when researchers observed unusually low rates of cardiovascular disease among Eskimo populations.[6] Researchers hypothesize that the dramatic dietary shift from an ancestral omega-6 to omega-3 fatty acid ratio of roughly 1:1 to a modern Western ratio of 20:1 or higher drives systemic inflammation and significantly elevates the risk of obesity.[7]

Increased consumption of omega-6 fats has been linked to higher rates of obesity, insulin resistance, hypertension, and coronary heart disease.[8] Evidence indicates that replacing dietary omega-6 fatty acids with plant and marine omega-3s may reduce the risk of cardiovascular disease and certain cancers due to the potential for omega-6 levels to inhibit the body's ability to synthesize and utilize omega-3s.[9] Consuming high amounts of omega-6 fatty acids may compromise cardiovascular health by displacing essential omega-3s as the two compete for the same enzymatic pathways, meaning excess omega-6 can directly interfere with omega-3 metabolism.[10] Maintaining a balanced dietary omega-6 to omega-3 ratio between 1:1 and 4:1 may optimally reduce inflammation and mitigate the risk of chronic conditions, including cardiovascular and neurodegenerative diseases.[11]

A balanced 1:1 omega-6 to omega-3 ratio is also correlated with the integrity and function of male sperm. Consequently, the highly skewed ratios typical of modern Western diets are heavily associated with impaired semen quality and increased rates of male infertility.[12] Animal models support these broader findings, demonstrating that a 1:1 ratio effectively decreases systemic and vascular inflammation in mice.[13]

To date, "no one knows what the optimal ratio in the diet is for these two families of fats."[14] Science writer Susan Allport writes that the current ratio in Japan is associated with a very low incidence of heart and other diseases. A dietary ratio of 4:1 produces almost a 1:1 ratio of highly unsaturated fatty acids (HUFAs) in cell membranes."[14][clarification needed] It has been estimated that in developed countries, the ratio of omega−6s to omega−3s is closer to 15:1[15] Another estimate is that "[t]he diet consumed by the typical American tends to contain 14–25 times more omega-6 fatty acids than omega-3 fatty acids."[16]

Despite the hypothesis that omega-6 and omega-3 polyunsaturated fatty acids competitively interact, some large-scale consortium analyses have found no evidence of a physiologically relevant interaction between the two regarding the risk of type 2 diabetes or other metabolic outcomes.[17] Several scientific advisories point out that actively reducing omega-6 intake simply to lower this ratio could inadvertently increase the risk of coronary heart disease.[18] According to a 2009 review by the American Heart Association, instead of avoiding ω−6 fats, the ω−6:ω−3 ratio should be decreased by consuming more ω−3 fats. The conversion rate of linoleic acid (LA) into arachidonic acid is very low with a diet high in linolenic acid.[19]

Fish

Food Citation Serving size (g) Omega−6 fatty
acids (mg)		 Omega−3 fatty
acids (mg)		 Ratio
Omega−6 to
omega−3
Salmon, wild, raw [20] 100 172 2018 0.085
Sardines, canned in oil [21] 1 can (90 g) 3260 1362 2.4
Sardines, canned in water [22] 1 can (90 g) 655 1457 0.45
Tuna, canned in water [23] 1 can (160 g) 14 460 0.030
Tuna, canned in oil [24] 1 can (170 g) 4588 345 13.3
Mackerel, canned [25] 1 can (360 g) 357 4970 0.072
Herring [26] 100 g 246 2418 0.10

Nuts and seeds

Food Citation Serving
size (g)		 Omega-6 fatty
acids (mg)		 Omega-3 fatty
acids (mg)		 Ratio
Omega-6 to
omega-3
Almonds, dry roasted [27] 100 12065 6 2010
Cashews [28] 100 7782 62 125
Chia seeds [29] 100 5785 17552 0.33
Coconut, raw [30] 100 366 - -
Flax seeds [31] 100 5911 22813 0.26
Hazelnuts, filberts [32] 100 7832 87 90
Hemp seeds [33] 100 56000 22000 2.5
Macadamia nuts, dry roasted [34] 100 1720 259 6.6
Pecans [35] 100 20630 986 21
Pistachios, raw [36] 100 13200 254 52
Poppy seed [37] 100 28291 273 104
Pumpkin seeds, whole, roasted [38] 100 8759 77 114
Sesame seeds, whole, dried [39] 100 21372 376 57
Sunflower seeds, kernels, dried [40] 100 23048 74 311
Walnuts [41] 100 38092 9079 4.2
Lentils, mature seeds, cooked, boiled, without salt [42] 100 137 37 3.7

See also

References

  1. ↑ Whitney Ellie; Rolfes SR (2008). Understanding Nutrition (11th ed.). California: Thomson Wadsworth. p. 154. 
  2. ↑ Bibus, Doug; Lands, Bill (April 18, 2015). "Balancing proportions of competing omega-3 and omega-6 highly unsaturated fatty acids (HUFA) in tissue lipids". Prostaglandins Leukot. Essent. Fatty Acids 99: 19–23. doi:10.1016/j.plefa.2015.04.005. PMID 26002802. 
  3. ↑ Andrew Stoll, The Omega-3 Connection. New York: Simon and Schuster, 2001, p. 43. "Populations maintaining historic omega-6 to omega-3 ratios (approximately 1 to 1) are protected from many of the scourges of the modern age."
  4. ↑ Simopoulos, Artemis P. (2010-09-01). "The omega-6/omega-3 fatty acid ratio: health implications" (in en). Oléagineux, Corps gras, Lipides 17 (5): 267–275. doi:10.1051/ocl.2010.0325. ISSN 1258-8210. https://www.ocl-journal.org/articles/ocl/abs/2010/05/ocl2010175p267/ocl2010175p267.html. 
  5. ↑ William Lands, Fish, Omega-3 and Human Health. Urbana, Illinois: APCS Press, 2005, p. 10.
  6. ↑ Dyerberg, Jorn (1979). "Haemostatic function and platelet polyunsaturated fatty acids in eskimos". The Lancet 314 (8140): 433–435. doi:10.1016/S0140-6736(79)91490-9. PMID 89498. Bibcode: 1979Lanc..314..433D. https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(79)91490-9/fulltext. Retrieved 10 May 2026. 
  7. ↑ Simopoulos, Artemis P. (2016). "An Increase in the Omega-6/Omega-3 Fatty Acid Ratio Increases the Risk for Obesity". Nutrients 8 (3): 128. doi:10.3390/nu8030128. PMID 26950145. DiNicolantonio, James J.; O'Keefe, James H. (2021). "The Importance of Maintaining a Low Omega-6/Omega-3 Ratio for Reducing the Risk of Autoimmune Diseases, Asthma, and Allergies". Missouri Medicine 118 (5): 453–459. PMID 34658440. 
  8. ↑ Saini, Ramesh Kumar; Keum, Young-Soo (2018). "Omega-3 and omega-6 polyunsaturated fatty acids: Dietary sources, metabolism, and significance — A review". Life Sciences 203: 255–267. doi:10.1016/j.lfs.2018.04.049. PMID 29715470. Simopoulos, Artemis P. (1994). "Is insulin resistance influenced by dietary linoleic acid and trans fatty acids?". Free Radical Biology and Medicine 17 (4): 367–372. doi:10.1016/0891-5849(94)90023-X. PMID 8001841. Simopoulos, Artemis P. (2002). "The importance of the ratio of omega-6/omega-3 essential fatty acids". Biomedicine & Pharmacotherapy 56 (8): 365–379. doi:10.1016/S0753-3322(02)00253-6. PMID 12442909. https://www.sciencedirect.com/science/article/pii/S0753332202002536. Retrieved 10 May 2026. Simopoulos, Artemis P. (2003). Omega-6/Omega-3 Essential Fatty Acid Ratio: The Scientific Evidence. S. Karger. ISBN 3-8055-7640-4. Strandvik, Birgitta (2011). "The omega-6/omega-3 ratio is of importance!". Prostaglandins, Leukotrienes and Essential Fatty Acids 85 (6): 405–406. doi:10.1016/j.plefa.2011.09.001. PMID 21945460. https://www.plefa.com/article/S0952-3278(11)00122-0/fulltext. Retrieved 10 May 2026. El-Badry, Ashraf Mohammad; Graf, Rolf; Clavien, Pierre-Alain (2007). "Omega 3 – Omega 6: What is right for the liver?". Journal of Hepatology 47 (5): 718–725. doi:10.1016/j.jhep.2007.08.005. PMID 17869370. 
  9. ↑ de Lorgeril, Michel; Salen, Patricia (2012). "New insights into the health effects of dietary saturated and omega-6 and omega-3 polyunsaturated fatty acids". BMC Medicine 10 (50). doi:10.1186/1741-7015-10-50. PMID 22613931. Bibcode: 2012BMCM...10...50D. 
  10. ↑ Farvid, Maryam S.; Ding, Ming (2014). "Dietary Linoleic Acid and Risk of Coronary Heart Disease: A Systematic Review and Meta-Analysis of Prospective Cohort Studies". Circulation 130 (18): 1568–1578. doi:10.1161/CIRCULATIONAHA.114.010236. PMID 25161045. Bibcode: 2014Circu.130.1568F. de Lorgeril, Michel; Salen, Patricia (2012). "New insights into the health effects of dietary saturated and omega-6 and omega-3 polyunsaturated fatty acids". BMC Medicine 10 (50). doi:10.1186/1741-7015-10-50. PMID 22613931. Bibcode: 2012BMCM...10...50D. Simopoulos, Artemis P. (2008). "The Importance of the Omega-6/Omega-3 Fatty Acid Ratio in Cardiovascular Disease and Other Chronic Diseases". Experimental Biology and Medicine 233 (6): 674–688. doi:10.3181/0711-MR-311. PMID 18408140. Innes, Jacqueline K.; Calder, Philip C. (2018). "Omega-6 fatty acids and inflammation". Prostaglandins, Leukotrienes and Essential Fatty Acids 132: 41–48. doi:10.1016/j.plefa.2018.03.004. PMID 29610056. Haque, M.; Rahman, M.; Alam, M.; Akter, S. (2017). "A Possible Approach for Maintaining Effective Omega-6/ Omega-3 Fatty Acid Ratio from Mixed Vegetable Oils". Journal of Environmental Science and Natural Resources 9 (2): 65–69. doi:10.3329/jesnr.v9i2.32159. Stoll, Andrew (2001). The Omega-3 Connection. New York: Simon and Schuster. p. 40. 
  11. ↑ Gutierres, D; Pacheco, R; Reis, CP (2025). "The Role of Omega-3 and Omega-6 Polyunsaturated Fatty Acid Supplementation in Human Health". Foods 14 (19): 3299. doi:10.3390/foods14193299. PMID 41097470. 
  12. ↑ Safarinejad, M. R.; Safarinejad, S. (2012). "The roles of omega-3 and omega-6 fatty acids in idiopathic male infertility". Asian Journal of Andrology 14 (4): 514–515. doi:10.1038/aja.2012.46. PMID 22659579. 
  13. ↑ DiNicolantonio, James J.; O'Keefe, James H. (2018). "Omega-6 vegetable oils as a driver of coronary heart disease: the oxidized linoleic acid hypothesis". Open Heart 5 (1). doi:10.1136/openhrt-2018-000898. PMID 30364556. Yehuda, S.; Carasso, R. L. (1993-11-01). "Modulation of learning, pain thresholds, and thermoregulation in the rat by preparations of free purified alpha-linolenic and linoleic acids: determination of the optimal omega 3-to-omega 6 ratio.". Proceedings of the National Academy of Sciences of the United States of America 90 (21): 10345–10349. doi:10.1073/pnas.90.21.10345. PMID 7901853. Bibcode: 1993PNAS...9010345Y. 
  14. ↑ 14.0 14.1 Susan Allport, The Queen of Fats: Why Omega-3 Fats Were Removed From the Western Diet and What We Can Do to Replace Them. Berkeley: University of California Press, 2007, p. 115.
  15. ↑ Simopoulos, AP (2002). "The importance of the ratio of omega-6/omega-3 essential fatty acids". Biomedicine & Pharmacotherapy 56 (8): 365–79. doi:10.1016/S0753-3322(02)00253-6. PMID 12442909. 
  16. ↑ "Omega-6 fatty acids | University of Maryland Medical Center". http://umm.edu/health/medical/altmed/supplement/omega6-fatty-acids. 
  17. ↑ Wu, J.; Marklund, M.; Imamura, F. (2017). "Omega-6 fatty acid biomarkers and incident type 2 diabetes: pooled analysis of individual-level data for 39 740 adults from 20 prospective cohort studies". The Lancet Diabetes & Endocrinology 5 (12): 965–974. doi:10.1016/S2213-8587(17)30307-8. PMID 29032079. Deol, P.; Fahrmann, J.; Yang, J. (2017). "Omega-6 and omega-3 oxylipins are implicated in soybean oil-induced obesity in mice". Scientific Reports 7 (1): 12488. doi:10.1038/s41598-017-12624-9. PMID 28970503. Bibcode: 2017NatSR...712488D. 
  18. ↑ Harris, William S.; Mozaffarian, Dariush (2009). "Omega-6 Fatty Acids and Risk for Cardiovascular Disease: A Science Advisory From the American Heart Association Nutrition Subcommittee of the Council on Nutrition, Physical Activity, and Metabolism; Council on Cardiovascular Nursing; and Council on Epidemiology and Prevention". Circulation 119 (6): 902–907. doi:10.1161/CIRCULATIONAHA.108.191627. PMID 19171857. Bibcode: 2009Circu.119..902H.  Furthermore, recent research challenges the competition model, indicating that a high intake of linoleic acid (an omega-6) does not necessarily decrease the body's total levels of long-chain omega-3 fatty acids.Harris, William S.; Shearer, Gregory C. (2014). "Omega-6 Fatty Acids and Cardiovascular Disease: Friend, Not Foe?". Circulation 130 (18): 1562–1564. doi:10.1161/CIRCULATIONAHA.114.012534. PMID 25161044. 
  19. ↑ Harris, WS; Mozaffarian, D; Rimm, E; Kris-Etherton, P; Rudel, LL; Appel, LJ; Engler, MM; Engler, MB et al. (17 February 2009). "Omega-6 fatty acids and risk for cardiovascular disease: a science advisory from the American Heart Association Nutrition Subcommittee of the Council on Nutrition, Physical Activity, and Metabolism; Council on Cardiovascular Nursing; and Council on Epidemiology and Prevention.". Circulation 119 (6): 902–7. doi:10.1161/CIRCULATIONAHA.108.191627. PMID 19171857. Bibcode: 2009Circu.119..902H. 
  20. ↑ "Fish, salmon, Atlantic, wild, raw Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/finfish-and-shellfish-products/4102/2. 
  21. ↑ "Fish, sardine, Atlantic, canned in oil, drained solids with bone Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. https://nutritiondata.self.com/facts/finfish-and-shellfish-products/4114/2. 
  22. ↑ "Fish, sardine, Atlantic, canned in oil, drained solids with bone Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. https://nutritiondata.self.com/facts/finfish-and-shellfish-products/4114/2. 
  23. ↑ "Fish, tuna, light, canned in water, without salt, drained solids Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. https://nutritiondata.self.com/facts/finfish-and-shellfish-products/4206/2. 
  24. ↑ "Fish, tuna, light, canned in oil, without salt, drained solids Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. https://nutritiondata.self.com/facts/finfish-and-shellfish-products/4205/2. 
  25. ↑ "Fish, mackerel, jack, canned, drained solids". Self Nutrition Data, Condé Nast. https://nutritiondata.self.com/facts/finfish-and-shellfish-products/4074/2. 
  26. ↑ "Fish, herring, Pacific, cooked, dry heat Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. https://nutritiondata.self.com/facts/finfish-and-shellfish-products/4219/2. 
  27. ↑ "Nuts, almonds [Includes USDA commodity food A256, A264 Nutrition Facts & Calories"]. Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/nut-and-seed-products/3085/2. 
  28. ↑ "Nuts, cashew nuts, raw Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/nut-and-seed-products/3095/2. 
  29. ↑ "Seeds, chia seeds, dried Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/nut-and-seed-products/3061/2. 
  30. ↑ "Nuts, coconut meat, raw Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/nut-and-seed-products/3106/2. 
  31. ↑ "Seeds, flaxseed Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/nut-and-seed-products/3163/2. 
  32. ↑ "Nuts, hazelnuts or filberts Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/nut-and-seed-products/3116/2. 
  33. ↑ Rodriguez-Leyva, D.; Pierce, G. N. (2010). "The cardiac and haemostatic effects of dietary hempseed". Nutrition & Metabolism (PubMed Central) 7: 32. doi:10.1186/1743-7075-7-32. PMID 20409317. 
  34. ↑ "Nuts, macadamia nuts, dry roasted, without salt added Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/nut-and-seed-products/3124/2. 
  35. ↑ "Nuts, pecans Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/nut-and-seed-products/3129/2. 
  36. ↑ "Nuts, pistachio nuts, raw Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/nut-and-seed-products/3135/2. 
  37. ↑ "Spices, poppy seed Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/spices-and-herbs/203/2. 
  38. ↑ "Seeds, pumpkin and squash seeds, whole, roasted, without salt Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/nut-and-seed-products/3141/2. 
  39. ↑ "Seeds, sesame seeds, whole, dried Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/nut-and-seed-products/3070/2. 
  40. ↑ "Seeds, sunflower seed kernels, dried Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/nut-and-seed-products/3076/2. 
  41. ↑ "Nuts, walnuts, english (Includes USDA commodity food A259, A257) Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. https://nutritiondata.self.com/facts/nut-and-seed-products/3138/2. 
  42. ↑ "Lentils, mature seeds, cooked, boiled, without salt Nutrition Facts & Calories" (in en-US). Self Nutrition Data, Condé Nast. http://nutritiondata.self.com/facts/legumes-and-legume-products/4338/2. 



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