Fatty acid ratio in food
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] The biological effects of the ω-3 and ω-6 fatty acids are mediated by their mutual interactions. 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.
Types of omega-3 fats
Of the omega-3s, only α-linolenic acid (ALA) is described as "essential". Indeed, other omega-3 fatty acids can be synthesized by the body from ALA. It is particularly present in linseed (flaxseed) and hemp seeds.
Eicosapentaenoic acid (EPA) can be synthesized from alpha-linolenic acid, although the conversion rate is very low. It is therefore important to consume foods rich in EPA, especially some oily fish. Populations that consume large amounts of fish (for example, the Inuit of Greenland and the Japanese) are significantly less affected by cardiovascular disease. In addition, EPA is transformed into eicosanoids of series 3, substances that contribute to the protection of the arteries and the heart and have recognized anti-inflammatory and anti-allergic effects.
Docosahexaenoic acid (DHA) is also present in marine products, especially in some oily fish. It plays a fundamental role in the development of the brain and retina as well as in the formation and motility of spermatozoa.
Omega-6 fatty acids tend to promote inflammation, which is at the base of many chronic diseases, including coronary heart disease.[3][4]
Omega-3 intake recommendations
The World Health Organization has made recommendations regarding omega-3 intake:
- ALA: 0.8 g to 1.1 g / day
- EPA + DHA: 0.3 g to 0.5 g / day
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.[5] At one extreme of the spectrum of hunter-gatherer diets, the Greenland Inuit, prior to the late Twentieth Century, consumed a diet in which omega-6s and omega-3s were consumed in a 1:2 ratio, thanks to a diet rich in cold-water fish (which are a rich source of omega-3s) and completely devoid of omega-6-rich seed oils.[6]
Optimal ratio of omega-6 to omega-3 fats
To date, "no one knows what the optimal ratio in the diet is for these two families of fats."[7] 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."[7]
In a study with rats, a dietary ratio of 4:1 showed significant favorable effects on learning performance and pain tolerance.[8]
Andrew Stoll, M.D., Director of the Psycho-pharmacology Research Laboratory at Harvard's McLean Hospital, who advocates the consumption of the two fats in a 1:1 ratio, states, "Once in the body, omega-3 and omega-6 fatty acids follow parallel pathways, continually competing with each other for chemical conversion to various structures and molecules inside and outside the cells. Given this mechanism, it makes sense that the two fats might be required in approximately equal amounts."[9]
Both Stoll and Allport assert that present-day diets in the developed world have departed dramatically from this ratio. It has been estimated that in developed countries, the ratio of omega-6s to omega-3s is closer to 15:1[10] 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."[11]
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 linolenic acid (LA) into arachidonic acid is very low with a diet high in linolenic acid.[12]
The maximum ω-6:ω-3 ratio allowed in dog food by the AAFCO is 30:1.[13]
Fish
Food | Citation | Serving size (g) | Omega-6 fatty acids (mg) | Omega-3 fatty acids (mg) | Omega-6 : omega-3 ratio |
---|---|---|---|---|---|
Atlantic salmon, wild, raw | [14] | 100 | 172 | 2018 | 1 : 11.7 |
Atlantic sardines, canned in oil, drained | [15] | 1 can (92 g) |
3260 | 1362 | 2.4 : 1 |
Tuna, canned in water, drained | [16] | 1 can (165 g) |
14.8 | 460 | 1 : 31.1 |
Tuna, canned in oil, drained | [17] | 1 can (171 g) |
4588 | 345 | 13.3 : 1 |
Cod, fresh and frozen | 4 oz (113 g) |
100 | 600 | 1 : 6 | |
Mackerel, canned, drained | [18] | 1 can (361 g) |
357 | 4970 | 1 : 13.9 |
Swordfish, fresh and frozen, cooked | 4 oz (113 g) |
300 | 1700 | 1 : 5.6 | |
Crab, soft shell, cooked | 4 oz (113 g) |
100 | 600 | 1 : 6 | |
Lobster, cooked | 4 oz (113 g) |
6 | 120 | 1 : 20 | |
Bluefish, fresh and frozen, cooked | 4 oz (113 g) |
300 | 1700 | 1 : 5.6 | |
Salmon, canned, drained | 4 oz (113 g) |
200 | 2200 | 1 : 11 | |
Smelt, rainbow | 4 oz (113 g) |
200 | 500 | 1 : 2.5 | |
Scallops, Maine, fresh and frozen, cooked | 4 oz (113 g) |
100 | 500 | 1 : 5 | |
Pacific herring | [19] | 100 g | 246 | 2418 | 1 : 9.8 |
Nuts and seeds
Food | Citation | Serving size (g) | Omega-6 (mg) | Omega-3 (mg) | Omega-6 : omega-3 ratio |
---|---|---|---|---|---|
Almonds, dry roasted | [20] | 100 | 12065 | 6 | 2010.8 : 1 |
Cashews | [21] | 100 | 7782 | 62 | 125.5 : 1 |
Chia seeds | [22] | 100 | 5785 | 17552 | 1 : 3 |
Coconut, raw | [23] | 100 | 366 | - | - |
Flax seeds | [24] | 100 | 5911 | 22813 | 1 : 3.9 |
Hazelnuts, filberts | [25] | 100 | 7832 | 87 | 90 : 1 |
Hemp seeds, hulled | [26] | 100 | 27358 | 8684 | 3.2 : 1 |
Pecans | [27] | 100 | 20630 | 986 | 20.9 : 1 |
Pistachios, raw | [28] | 100 | 13200 | 254 | 52 : 1 |
Poppy seed | [29] | 100 | 28291 | 273 | 103.6 : 1 |
Pumpkin seeds, whole, roasted, without salt | [30] | 100 | 8759 | 77 | 113.8 : 1 |
Sesame seeds, whole, dried | [31] | 100 | 21372 | 376 | 56.8 : 1 |
Sunflower seeds, kernels, dried | [32] | 100 | 23048 | 74 | 311.5 : 1 |
Walnuts | [33] | 100 | 38093 | 9080 | 4.2 : 1 |
Sacha Inchi seeds | [34] | 1 oz (28 g) |
5486 | 4771 | 1.15 : 1 |
Lentils, mature seeds, cooked, boiled, without salt | [35] | 100 | 137 | 37 | 3.7 : 1 |
Oils
Food | Citation | Serving size | Omega-6 (mg) | Omega-3 (mg) | Omega-6 : omega-3 ratio |
---|---|---|---|---|---|
Avocado oil | [36] | 1 Tbsp (14 g) | 1754 | 134 | 13.09 : 1 |
Butter | [37] | 1 Tbsp (14 g) | 382 | 44.1 | 8.7 : 1 |
Canola oil | [38] | 1 Tbsp (14 g) | 2610 | 1279 | 2 : 1[39] |
Coconut oil | [40] | 1 Tbsp (14 g) | 243 | - | - |
Cod liver oil | [41] | 1 Tbsp (14 g) | 126 | 2664 | 1 : 21.1 |
Corn oil | [42] | 1 Tbsp (14 g) | 7224 | 157 | 46 : 1[39] |
Cotton seed oil | [43] | 1 Tbsp (14 g) | 6953 | 27 | 257.5 : 1 |
Flax seed oil | [44] | 1 Tbsp (14 g) | 1715 | 7196 | 1 : 4.2 |
Ghee | [45] | 1 Tbsp (14 g) | ? | ? | 1.5:1 |
Grape seed oil | [46] | 1 Tbsp (14 g) | 9395 | 13.5 | 696 : 1 |
Hemp seed oil | [47][48] | ? | ? | ? | 2:1-3:1 [note 1] |
Lard | [49] | 1 Tbsp (13 g) | 1300 | 128 | 10.2 : 1 |
Olive oil | [50] | 1 Tbsp (14 g) | 1318 | 103 | 12.8 : 1 |
Palm oil | [51] | 1 Tbsp (14 g) | 1228 | 27 | 45.5 : 1 |
Peanut oil | [52] | 1 Tbsp (14 g) | 4950 | - | - |
Perilla oil | [53] | 1 Tbsp (14 g) | 1680 | 8960 | ~1 : 5 |
Sardine oil | [54] | 1 Tbsp (14 g) | 272 | 3253 | 1 : 12 |
Soybean oil (hydrogenated) | [55] | 1 Tbsp (14 g) | 6116 | 378 | 16.2 : 1 |
Soybean oil, (Unhydrogenated) | [56] | 1 Tbsp (14 g) | 6807 | 917 | 7.4 : 1[39] |
Tallow (Grain Fed) | [57] | 3.35% | 0.200% | 16.3 : 1 | |
Tallow (Grass Fed) | [57] | 1.2% (168 mg) | 0.8% (112 mg) | 1.4 : 1 | |
Walnut oil | [58] | 1 Tbsp (14 g) | 7141 | 1404 | 5.1 : 1 |
Grains and beans
Food | Citation | Serving size (g) | Omega-6 (mg) | Omega-3 (mg) | Omega-6 : omega-3 ratio |
---|---|---|---|---|---|
Matpe (Vigna mungo bean), boiled | [59] | 100 | 24 | 335 | 1 : 14 |
Peanut, All types, raw | [60] | 100 | 15691 | 3 | 5320.3 : 1 |
Soybeans, dried, cooked | [61] | 100 | 4466 | 598 | 7.5 : 1 |
Tofu, regular | [62] | 100 | 2380 | 319 | 7.5 : 1 |
Nattō, regular | [63] | 100 | 5476 | 734 | 7.5 : 1 |
Chickpeas, mature seeds, cooked, boiled, without salt | [64] | 100 | 1113 | 43 | 25.9 : 1 |
Brown beans, boiled | [65] | 100 | 20 | 15 | 1.3:1 |
Pasta, whole wheat, boiled | [66] | 100 | 30 | 2 | 15:1 |
Green, leafy vegetables
Food | Citation | Serving size (g) | Omega-6 (mg) | Omega-3 (mg) | Omega-6 : omega-3 ratio |
---|---|---|---|---|---|
Arugula raw | [67] | 1 cup | 26 | 34 | 1 : 1.3 |
Green leaf lettuce, fresh, raw | [68] | 100 | 24 | 58 | 1 : 2.4 |
Red leaf lettuce, fresh, raw | [69] | 100 | - | - | - |
Boston lettuce or Bibb lettuce, fresh, raw | 1 cup | - | - | - | |
Brussels sprouts cooked | [70] | 100 | 79 | 173 | 1 : 2.2 |
Cabbage red, raw | [71] | 100 | 34 | 45 | 1 : 1.3 |
Chinese cabbage cooked, boiled, drained, without salt | [72] | 100 | 31 | 41 | 1 : 1.3 |
Chard, cooked, boiled, drained, without salt | [73] | 1 cup | 43.7 | 5.3 | 8.2 : 1 |
Sauerkraut, canned, low sodium | [74] | 100 | 26 | 25 | 1 : 1 |
Spinach, cooked, boiled, drained, without salt | [75] | 100 | 17 | 92 | 1 : 5.4 |
Turnip greens, cooked | [76] | 100 | 28 | 64 | 1 : 2.3 |
Dandelion greens, cooked | 1/2 cup | - | 0.1 | - | |
Kale, cooked | 1/2 cup | 0.1 | 0.1 | 1 : 1 | |
Kohlrabi raw | [77] | 1 cup | 27 | 35 | 1 : 1.7 |
Beet greens, cooked | [78] | 100 | 65 | 6 | 10.8 : 1 |
Collard greens, cooked, boiled, drained, without salt | [79] | 1 cup | 133 | 177 | 1 : 1.3 |
Mustard greens, cooked, boiled, drained, without salt | [80] | 100 | 24 | 22 | 1.1 : 1 |
Root vegetables
Food | Citation | Serving size (g) | Omega-6 (mg) | Omega-3 (mg) | Omega-6 : omega-3 ratio |
---|---|---|---|---|---|
Carrots, raw | [81] | 100 | 115 | 2 | 57.5 : 1 |
Beets, raw | [82] | 100 | 55 | 5 | 11 : 1 |
Parsley, raw | [83] | 100 | 115 | 8 | 14.4 : 1 |
Turnips, raw | [84] | 100 | 12 | 40 | 1 : 3.3 |
Pumpkins and squashes
Food | Citation | Serving size (g) | Omega-6 (mg) | Omega-3 (mg) | Omega-6 : omega-3 ratio |
---|---|---|---|---|---|
Butternut squash, Squash, winter, butternut, cooked, baked, without salt | [85] | 100 | 14 | 24 | 1 : 1.7 |
Zucchini, Squash, summer, zucchini, includes skin, raw | [86] | 100 | 14 | 24 | 1 : 1.7 |
Acorn squash, Squash, winter, acorn, cooked, baked, without salt | [87] | 100 | 22 | 37 | 1 : 1.7 |
Tomatoes, Tomatoes, red, ripe, raw | [88] | 100 | 80 | 3 | 26.7 : 1 |
Meat
Food | Citation | Serving size | Omega-6 (%) | Omega-3 (%) | Omega-6 : omega-3 ratio |
---|---|---|---|---|---|
Kangaroo, average of all cuts and species. Measured on raw cut weight. | % of total fat | 27.4 | 10.7 | 2.5 : 1 | |
Beef, Angus cattle, grass-fed | [89] | % of total fatty acids | 5.00 | 2.95 | 1.72 : 1 |
Beef, Angus cattle, grain-fed | [89] | % of total fatty acids | 8.05 | 0.86 | 10.38 : 1 |
See also
- Monounsaturated fat
- For listings of particular classes of polyunsaturated fatty acids, see:
- Polyunsaturated fatty acid
- Polyunsaturated fat
- Omega-3 fatty acid
- Omega-6 fatty acid
- Omega-9 fatty acid
- Conjugated linoleic acid
- Essential fatty acid – for biochemistry of most polyunsaturated fats
- Essential fatty acid interactions – for the interactions between ω-6 and ω-3 fatty acids
- Unsaturated fat
Notes
- ↑ The authors state the ratio as omega-6:omega-3 and that it lies "between 2:1 and 3:1".
References
- ↑ Whitney Ellie; Rolfes SR (2008). Understanding Nutrition (11th ed.). California: Thomson Wadsworth. p. 154.
- ↑ 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.
- ↑ Simopoulos, A. P. (2008). "TThe omega-6/omega-3 fatty acid ratio, genetic variation, and cardiovascular disease". Experimental Biology and Medicine (Maywood, N.J.). 233 (6): 674–688. doi:10.3181/0711-MR-311. PMID 18408140. S2CID 9044197. Retrieved 2021-09-23.
- ↑ Simopoulos, A. P. (2008). "The importance of the omega-6/omega-3 fatty acid ratio in cardiovascular disease and other chronic diseases". Experimental Biology and Medicine (Maywood, N.J.). 233 (6): 674–688. doi:10.3181/0711-MR-311. PMID 18408140. S2CID 9044197. Retrieved 2021-09-23.
- ↑ 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."
- ↑ William Lands, Fish, Omega-3 and Human Health. Urbana, Illinois: APCS Press, 2005, p. 10.
- 1 2 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.
- ↑ 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. PMC 47771. PMID 7901853.
- ↑ Andrew Stoll, The Omega-3 Connection. New York: Simon and Schuster, 2001, p. 40.
- ↑ 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.
- ↑ http://umm.edu/health/medical/altmed/supplement/omega6-fatty-acids
- ↑ Harris, WS; Mozaffarian, D; Rimm, E; Kris-Etherton, P; Rudel, LL; Appel, LJ; Engler, MM; Engler, MB; Sacks, F (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. Lay summary.
{{cite journal}}
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(help) - ↑ "AAFCO methods for substantiating nutritional adequacy of dog and cat foods (proposed for 2014 publication)" (PDF). AAFCO. 2013.
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- ↑ "Nuts, almonds [Includes USDA commodity food A256, A264] Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. Archived from the original on 2019-01-14. Retrieved 2019-02-15.
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- ↑ "Seeds, hemp seed, hulled". United States Department of Agriculture. Retrieved 2020-01-30.
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- 1 2 3 "Omega 6 Omega 3 Ratio: How to compare omega 6 and omega 3". Wellwise.org. Archived from the original on 2018-08-25. Retrieved 2019-02-15.
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{{cite book}}
: CS1 maint: multiple names: authors list (link) - ↑ Callaway, J. C. (2004). "Hempseed as a nutritional resource: An overview". Euphytica. 140 (1–2): 65–72. doi:10.1007/s10681-004-4811-6. ISSN 0014-2336. S2CID 43988645.
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{{cite web}}
: CS1 maint: url-status (link) - ↑ "Pasta wholemeal boiled". NEVO. RIVM. 2019. Retrieved 2021-08-06.
{{cite web}}
: CS1 maint: url-status (link) - ↑ "Arugula, raw".
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- ↑ "Beet greens, cooked, boiled, drained, without salt Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. Archived from the original on 2018-06-26. Retrieved 2019-02-17.
- ↑ "Collards, cooked, boiled, drained, without salt".
- ↑ "Mustard greens, cooked, boiled, drained, without salt Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. Archived from the original on 2018-06-26. Retrieved 2019-02-17.
- ↑ "Carrots, raw [Includes USDA commodity food A099] Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. Archived from the original on 2019-01-31. Retrieved 2019-02-17.
- ↑ "Beets, raw Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. Archived from the original on 2019-01-30. Retrieved 2019-02-17.
- ↑ "Parsley, raw Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. Archived from the original on 2018-12-12. Retrieved 2019-02-17.
- ↑ "Turnips, raw Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. Archived from the original on 2019-01-31. Retrieved 2019-02-17.
- ↑ "Squash, winter, butternut, cooked, baked, without salt Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. Archived from the original on 2019-02-12. Retrieved 2019-02-17.
- ↑ "Squash, summer, zucchini, includes skin, raw Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. Archived from the original on 2018-06-20. Retrieved 2019-02-17.
- ↑ "Squash, winter, acorn, cooked, baked, without salt".
- ↑ "Tomatoes, red, ripe, raw, year round average [Includes USDA commodity food A238, A233] Nutrition Facts & Calories". Self Nutrition Data, Condé Nast. Archived from the original on 2018-06-28. Retrieved 2019-02-17.
- 1 2 Garcia, P.T.; Pensel, N.A.; Sancho, A.M.; Latimori, N.J.; Kloster, A.M.; Amigone, M.A.; Casal, J.J. (2008). "Beef lipids in relation to animal breed and nutrition in Argentina". Meat Science. 79 (3): 500–508. doi:10.1016/j.meatsci.2007.10.019. PMID 22062910.