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Home > Anti-aging Research > Linolenic Acid

Omega-6 (Linoleic Acid, Gamma linolenic acid, Dihommagamma-linolenic Acid, Arachidonic Acid)

Note:  Please take a minute to read my essential fatty acids (EFA) page, which will clear up some of the confusion regarding EFAs.

Fatty Acids by Category
Omega-6 Omega-3 Omega-9
polyunsaturated polyunsaturated monounsaturated
LA - Linoleic Acid ALA or LNA - Alpha linolenic acid Oleic acid
GLA - Gamma linolenic acid EPA - Eicosapentaenoic acid  
DGLA - Dihomo gamma-linolenic Acid DHA - Docosahexaenoic acid  
AA - Arachidonic Acid DPA (omega 3) - Docosapentaenoic acid  
DTA - Docosatetraenoic acid    
DPA -  (omega 6) Docosapentaenoic    

Related Topics:

CME:

  • Omega 3: Implications in human health and disease - PowerPak, exp. 8/1/03 - "The omega 6 LA comprises 7% to 9% of our daily caloric intake, while the omega 3 LNA makes up about 0.7% of energy. It is therefore estimated that the dietary ratio of LA to LNA ranges from 10 to 20:1, at which level the metabolism of LNA is strongly suppressed. Again, this is far more than the recommended ratio of 2.3:1 ... From an evolutionary perspective, a significant change in the diet has occurred in a very short time. The diet of our ancestors in the Paleolithic period (400,000 to 45,000 years ago) was lower in fat and balanced in omega 6 and omega 3—a ratio of 1:1, or 10- to 20-fold lower than today's standard."

News & Research:

  • 7 easy ways to boost your immune system - MSNBC, 11/12/11 - "Cook with olive and canola oils ... Research shows that people who consume disproportionately more 6s (found in the soybean oil used in most processed snack foods) than 3s are at higher risk for inflammation and immune system problems"
  • A dose of safflower oil each day might help keep heart disease at bay - Science Daily, 3/21/11 - "safflower oil reduced abdominal fat and increased muscle tissue in this group of women after 16 weeks of daily supplementation ... Safflower oil contains linoleic acid, which is a PUFA -- a polyunsaturated fatty acid ... For this current research, the scientists performed a secondary analysis of data collected from that clinical trial, applying a powerful statistical analysis to the results and also checking to see how long it took for any effects of the oils to appear in the women's health profiles" - Note:  It was in the news so I included it but I'm not buying it.  American's already get about 10 to 20 times too much omega-6.  So using their theory they should already be healthy.
  • Omega-3 fatty acid intake linked with reduced risk of age-related macular degeneration in women - Science Daily, 3/14/11 - "Brigham and Women's Hospital and Harvard Medical School, Boston, and colleagues collected data on 38,022 women who had not been diagnosed with age-related macular degeneration. Information on women's eating habits was obtained via questionnaire at the beginning of the study and included information on intake of docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) [Omega-3 fatty acids found in fish], and arachidonic acid and linoleic acid (omega-6 fatty acids). During ten years of follow-up, additional questionnaires tracked the women's eye health, with specific focus on diagnosis of age-related macular degeneration ... women who consumed the most DHA compared with women who consumed the lowest amount had a 38 percent lower risk of developing age-related macular degeneration. Similar results were observed for higher intake of EPA and for higher consumption of both types of acid together ... consumption of one or more servings of fish per week, when compared to less than one per month, was associated with a 42 percent lower risk of age-related macular degeneration ... For omega-6 fatty acids, higher intake of linoleic acid but not arachidonic acid was associated with an increased risk of age-related macular degeneration, however this association was non-significant after adjustment for other risk factors and fats" - See Mega Twin EPA at iHerb and Jarrow Max DHA at iHerb.
  • Essential oil pill prevents PMS, study suggests - Science Daily, 1/16/11 - "Women who were given capsules containing 2 grams of a combination of gamma linolenic acid, oleic acid, linoleic acid, other polyunsaturated acids and vitamin E reported significantly eased PMS symptoms at both 3 and 6 months after they began the treatment" - See borage oil products at iHerb (GLA) and Jarrow FamilE (contains all eight members of the vitamin E family, includes Tocomin) at iHerb.  Oleic acid is omega-9 in which olive oil is a good source.  Linoleic acid is omega-6.  Most Americans get about 10 to 20 times too much omega-6 to begin with.  I don't know why they included it.  It makes me wonder about some of the researchers.  If they are showing a benefit, I would guess it's from the other ingredients and not the omega-6.  Gamma linolenic acid is an omega-6 also but it's a form that most don't get enough of.
  • Excessive intake of omega 6 and deficiencies in omega 3 induce obesity down the generations - Science Daily, 7/26/10 - "Chronic excess of linoleic acid (omega 6), coupled with a deficiency in alpha-linoleic acid (omega 3), can increase obesity down the generations ... In the past forty years, there has been a steady rise in obesity over the generations in Western societies. During the same period, the diet in industrialized countries has seen a quantitative increase in the calories ingested (lipids account for 35 to 40% of food intake), high levels of linoleic acid (omega 6) and low levels of alpha-linoleic acid (omega 3). Indeed, the amount of omega 6 consumed during the past forty years has rocketed (+250%) while that of omega 3 has fallen by 40%, thus destabilizing the omega 6/omega 3 ratio when compared with the recommended intakes. While the French Food Safety Agency (AFSSA) recommends an omega 6/omega 3 ratio of 5/1, actual consumption is 15 omega 6 for 1 omega 3. In the USA, this ratio can even reach 40 omega 6 for 1 omega 3 ... researchers exposed four generations of mice to a Western-style diet, characterized by these same omega 6/omega 3 ratios. As a result, they saw a gradual increase in fat mass over several generations"
  • Cutting fat and calories can lower cancer risk in dogs and people - Science Daily, 7/22/10 - "As many as 1 out of 3 cancer deaths in both humans and dogs could be prevented by reducing Omega-6 fatty acids and cutting calories ... Omega-6, such as corn oil, vegetable oil and grain-fed red meat. Too much Omega-6 fatty acid can lead to inflammation, which creates an environment conducive to cancer in dogs and people ... obesity in both dogs and humans limits the production of adiponectin, a hormone that has been shown to inhibit cancer cell growth. He recommended reducing calories, particularly those from sugar, which has the additional danger of not only causing obesity, but also feeding cancer cells and encouraging their growth ... the ideal blend of fiber for dog food is about 75 to 80 percent insoluble and 20 to 25 percent soluble. In addition, adding quality prebiotics to pet foods can enhance their gut health"
  • Lack of omega-6 fatty acid linked to severe dermatitis - Science Daily, 4/14/10 - "Without arachidonic acid, the mice developed severe ulcerative dermatitis. The animals were very itchy, they scratched themselves continuously, and they developed a lot of bleeding sores" - Note:  I doubt if that's a problem in America where they get way to much omega-6 already.
  • More omega-3, less omega-6 for colorectal protection - Nutra USA, 8/12/09 - "the dietary total omega-6 to omega-3 PUFA ratio was strongly associated with colorectal cancer risk ... Compared to women with the lowest ratio, women with the highest ratio of omega-6 to -3 had a relative risk 95 per cent higher" - [Abstract]
  • Omega Fatty Acid Balance Can Alter Immunity And Gene Expression - Science Daily, 5/29/09 - "Anthropological evidence suggests that human ancestors maintained a 2:1 w6/w3 ratio for much of history, but in Western countries today the ratio has spiked to as high as 10:1. Since these omega fatty acids can be converted into inflammatory molecules, this dietary change is believed to also disrupt the proper balance of pro- and anti- inflammatory agents, resulting in increased systemic inflammation and a higher incidence of problems including asthma, allergies, diabetes, and arthritis ... many key signaling genes that promote inflammation were markedly reduced compared to a normal diet, including a signaling gene for a protein called PI3K, a critical early step in autoimmune and allergic inflammation responses" - See Mega Twin EPA at iHerb and Jarrow Max DHA at iHerb.
  • Expert Panel: Omega-6 Won't Hurt Heart - WebMD, 1/26/09 - "reducing omega-6 polyunsaturated fatty acids (PUFAs) from their current levels would be more likely to increase the typical American's risk for heart disease than decrease it" - I don't know if I'd go by that.  It contradicts everything I've read but on the other hand I couldn't find anything on my omega-6 page to support that but sometimes I wonder if they read just what they want to read. - Ben
  • Canola Oil May Affect Breast Cancer Risk - WebMD, 11/18/08 - "Could the type of oil a woman consumes during pregnancy influence her daughter's breast cancer risk years later? ... pregnant women may be better off choosing canola oil over most other vegetable oils ... Corn oil has 50% omega-6 and almost no omega-3, while canola oil has 20% omega-6 and 10% omega-3,""
  • Reducing Intake Of Dietary Fat Prevents Prostate Cancer In Mice - Science Daily, 5/15/08 - "focused on fat from corn oil, which is made up primarily of omega-6 fatty acids, or the polyunsaturated fat commonly found in the Western diet ... Researchers fed one group of mice a diet with about 40 percent of calories coming from fat, a percentage typical in men eating a Western diet. The other group received 12 percent of their calories from fat, a figure considered to be a very low fat diet. Researchers found there was a 27 percent reduced incidence of prostate cancer in the low-fat diet group. Aronson also studied cells in the prostate that were precancerous, or would soon become cancer, and found that the cells in the mice eating the low-fat diet were growing much more slowly than those in the high-fat group"
  • Diets With High Omega-6:Omega-3 Ratios Enhance Risk for Depression, Inflammatory Disease - Medscape, 4/25/08 - "Whereas the early hunter-gatherers had a dietary omega-6:omega-3 ratio of 2:1 to 3:1, this ratio is now 15:1 to 17:1 in North America today ... It is believed that these dietary changes might be related to increases in inflammatory-related diseases, including depression and cardiovascular disease ... at higher levels of depressive symptoms, as the omega-6:omega-3 ratio increased, there was a marked increase in proinflammatory cytokine levels ... compared with the study participants who did not have syndromal depression, the 6 participants who had depression had significantly higher omega-6:omega-3 ratios and higher levels of proinflammatory cytokines" - See Mega Twin EPA at iHerb.
  • Omega-3 Fatty Acids Protect Against Parkinson's, Study Says - Science Daily, 11/26/07 - "Omega-3 fatty acids protect the brain against Parkinson's disease ... omega-3 fatty acids--in particular DHA (docosahexaenoic acid), a specific type of omega-3--had replaced the omega-6 fatty acids already present in the brains of the mice that had been given omega-3 supplementation" - See Jarrow Max DHA at iHerb.
  • Nutrient intake and risk of squamous cell carcinoma of the esophagus: a case-control study in Uruguay - Nutr Cancer. 2006;56(2):149-57 - "The odds ratio (OR) for high intake of linoleic acid was 1.4 (95% confidence interval, CI = 1.2-1.6), whereas lycopene displayed a strong protective effect (OR = 0.7; 95% CI = 0.6-0.9)"
  • Vitamin C May Slow Skin Wrinkling - WebMD, 10/8/07 - "After adjusting for other factors likely to influence skin aging, such as sun exposure and smoking, vitamin C and linoleic acid were independently associated with skin aging ... After digestion, linoleic acid is converted to DHA and EPA -- two fatty acids" - See vitamin C products at iHerb and Mega Twin EPA at iHerb. - Note:  I'm not sure that is correct.  Linoleic acid is an omega-6, which is not converted to DHA and EPA.  Most Americans get about ten time too much omega-6 already.
  • Corn oil, omega-6 could speed up prostate cancer, study - Nutra USA, 2/1/06 - "After we added omega-6 fatty acids to the growth medium in the dish, and only omega-6, we observed that tumors grew twice as fast as those without omega-6" - [HealthDay] [WebMD]
  • Fatty Acids May Ward Off Alzheimer's Disease - WebMD, 9/27/05 - "In people who did not have the gene, eating a diet rich in linoleic acids reduced the risk of developing Alzheimer's disease by about 50%. But in those who carried the disease-causing gene, linoleic acids appeared to raise the risk of developing the mind-robbing disease even further"
  • Balance of Essential Fats May Prevent Bone Loss After Menopause - Doctor's Guide, 7/13/05 - "After 12 weeks, rats with the lowest ratio of omega-6 to omega-3 fatty acids in their diet experienced significantly less bone loss than rats in the other dietary groups ... A 5-to-1 dietary ratio of omega-6 to omega-3 fatty acids led to a conservation of bone mineral content that we didn't see with a 10-to-1 ratio" -  See Mega Twin EPA at iHerb.
  • Modern diet may be causing depression - Nutra USA, 5/26/05 - "The finding lends itself nicely to the theory that increased omega-3 fatty acid intake may shift the balance between the two fatty acid families in the brain, since it has been demonstrated in animal studies that increased omega-3 fatty acid intake may result in decreased brain arachidonic acid"
  • One 'Good Fat' May Also Have A Downside - CBS 2 Chicago, 5/25/05 - "It's an omega-6 fatty acid called arachidonic acid found in most oils and meat. When levels of it are high in the brains of rats, they showed signs of depression ... the ill effects may be diluted by adding more omega-3 fatty acids"
  • Understanding Essential Fatty Acids - Health Supplement Retailer 01/03 - "The omega-6 LA is fairly prevalent in the human diet, as it is found in a wide variety of vegetable and seed oils. However, many people do not have good enzymatic conversion by the delta-6 desaturase enzyme of LA to GLA. GLA and dihomogamma linolenic acid (DGLA) are the precursors for the series 1 prostaglandins. As such, they regulate a number of body functions, including skin integrity and joint lubrication"
  • Sunflower Seed May Hold Key To Reducing Hypertension And Preventing Debilitating Strokes - Intelihealth, 8/27/02 - "One of the leading contributors to a stroke is hypertension. Before a stroke occurs, prolonged hypertension has been associated with a range of impairments and cognitive ability ... Now a researcher suggests that linoleic acid, a doubly unsaturated fatty acid, which is essential in nutrition in mammals. It cannot be produced in animals, the sources of this needed nutrient are vegetable seed oils, such as: safflower, sunflower, and hemp seed ... Linoleic acid administration seems to significantly decrease the systolic blood pressures of SHRs [spontaneously hypertensive rats] at three and six months ... This further supports the assertion that administering linoleic acid to SHRs did not only result in improvement of spatial reference memory but also significantly increased Bmax of D1 dopamine receptors"
  • Linoleic Acid Intake May Help Cut Stroke Risk - Intelihealth, 8/2/02
  • Fatty Acid Lowers Stroke Risk - WebMD, 8/1/02 - "a fatty acid found in corn, sunflower, and safflower oils and soybeans may help prevent strokes ... the fatty acid known as linoleic acid may reduce the risk of strokes, especially those caused by blood clots ... for every 5% increase in the level of linoleic acid, there was a 28% reduction in the risk of either type of stroke, a 34% drop in the risk of clot-related strokes, and 19% decline in hemorrhagic strokes"
  • Essential Fatty Acids Improve Thought Process and Behavior in Children with ADHD - New Hope Natural Media Online, 6/13/02 - "ADHD is characterized by impulsive behavior, lack of concentration, restlessness and, in some cases, learning disabilities ... The children were given either a supplement containing 186 mg of eicosapentaenoic acid (EPA), 480 mg of docosahexaenoic acid (DHA), 96 mg of gamma-linolenic acid (GLA), 864 mg of linoleic acid, and 60 IU of vitamin E per day, or a placebo ... the children who took the essential fatty acid supplement had significant improvement in symptom scores related to learning and behavior"
  • Study: Snacks May be Bad for Vision - Intelihealth, 8/15/01 - "The study found that diets high in omega-3 fatty acids, found primarily in albacore tuna and salmon, could lessen the risk for age-related macular degeneration, as long as fish eaters maintain a low intake of linoleic acid (found in processed food and margarine)."
  • GLA (Gamma Linolenic Acid): The Good Omega-6 Essential Fatty Acid - Total Health for Longevity Magazine, 9/00

Abstracts:

  • ω-3 and ω-6 polyunsaturated fatty acid intakes and the risk of breast cancer in Mexican women: impact of obesity status - Cancer Epidemiol Biomarkers Prev. 2011 Dec 22 - "Overall, there was no significant association between ω-3 PUFA intake and breast cancer risk (p=0.31). An increased risk of breast cancer was associated with increasing ω-6 PUFA intake in pre-menopausal women (OR=1.92, 95% CI=1.13;3.26; p=0.04). A decreased risk of breast cancer was significantly associated with increasing ω-3 PUFA intake in obese women (OR=0.58, 95%CI=0.39;0.87; p=0.008), but not in normoweight nor in overweight women (p for heterogeneity = 0.017)"
  • Dietary Omega-3 Fatty Acid, Ratio of Omega-6 to Omega-3 Intake, Inflammation, and Survival in Long-term Hemodialysis Patients - Am J Kidney Dis. 2011 Jun 7 - "each 1-unit higher ratio of omega-6 to omega-3 intake was associated with a 0.55-mg/L increase in serum CRP level (P = 0.03). In the fully adjusted model, death HRs for the first (1.7-<7.6), second (7.6-<9.3), third (9.3-<11.3), and fourth (11.3-17.4) quartiles of dietary omega-6 to omega-3 ratio were 0.39 (95% CI, 0.14-1.18), 0.30 (95% CI, 0.09-0.99), 0.67 (95% CI, 0.25-1.79), and 1.00 (reference), respectively (P for trend = 0.06) ... Higher dietary omega-6 to omega-3 ratio appears to be associated with both worsening inflammation over time and a trend toward higher death risk in hemodialysis patients"
  • Omega-3 status in pregnancy linked to childhood obesity: Study - Nutra USA, 5/6/11 - "A higher ratio of cord plasma omega-6 to omega-3 polyunsaturated fatty acids (PUFAs) was associated with higher subscapular and triceps [skinfold thicknesses] and odds of obesity ... around one fifth expectant mothers ate more than 2 fish meals per week at mid-pregnancy, however only about half of these women achieved the recommend intake of DHA of 200 mg per day ... Only three per cent of pregnant women in the study were found to consume the recommended intake of 200 mg/day of DHA in the last month of pregnancy ... this is the time when large amounts of DHA are transferred from the mother to the infant to support brain development ... the odds of obesity in 3-year-olds were between two and four times higher when cord blood had a high ratio of omega-6 to omega-3 fatty acids ... In contrast, the odds of obesity were 32 per cent lower when maternal consumption of omega-3s was high or if the ratio of omega-3 to omega-6 was at close to recommended levels" - [Abstract] - See Mega Twin EPA at iHerb and Jarrow Max DHA at iHerb.
  • Dietary polyunsaturated fatty acids and breast cancer risk in Chinese women: A prospective cohort study - Int J Cancer. 2010 Sep 28 - "We found no association of breast cancer risk to dietary intake of linoleic acid, arachidonic acid, α-linolenic acid, or marine-derived n-3 PUFA. We found a statistically significant interaction between n-6 PUFA intake, marine-derived n-3 PUFA intake and breast cancer risk (p = 0.008). Women with lower intake (the lowest tertile) of marine-derived n-3 PUFA and higher intake (the highest tertile) of n-6 PUFA had an increase risk for breast cancer (RR=2.06; 95% CI=1.27-3.34) compared to women with higher intake (the highest tertile) of marine-derived n-3 PUFAs and lower intake (the lowest tertile) of n-6 PUFAs after adjusting for potential confounders. The relative amounts of n-6 PUFA to marine-derived n-3 PUFAs may be more important for breast cancer risk than individual dietary amounts of these fatty acids" - See Mega Twin EPA at iHerb and Jarrow Max DHA at iHerb.
  • A prospective study of dietary polyunsaturated fatty acids and colorectal cancer risk in Chinese women - Cancer Epidemiol Biomarkers Prev. 2009 Aug;18(8):2283-91 - "The dietary total n-6 to n-3 PUFA ratio was strongly associated with colorectal cancer risk. Compared with women in the lowest quintile group, elevated relative risks (RR) were observed for the second [RR, 1.52; 95% confidence intervals (CI), 1.00-2.32], third (RR, 2.20; 95% CI, 1.41-3.45), fourth (RR, 1.65; 95% CI, 0.99-2.75), and fifth (RR, 1.95; 95% CI, 1.07-3.54) quintile groups. Arachidonic acid was associated with colorectal cancer risk with elevated RRs of 1.20(Q2-Q1) (95% CI, 0.87-1.64), 1.44(Q3-Q1) (95% CI, 1.05-1.98), 1.61(Q4-Q1) (95% CI, 1.17-2.23), and 1.39(Q5-Q1) (95% CI, 0.97-1.99; P(trend) = 0.03) with increasing dietary quintile"
  • Dietary intakes of omega-6 and omega-3 polyunsaturated fatty acids and the risk of breast cancer - Int J Cancer. 2008 Sep 9 - "Breast cancer risk was not related to any dietary PUFA overall; however, opposite associations were seen according to food sources, suggesting other potential effects than PUFA per se. Breast cancer risk was inversely associated with alpha-linolenic acid (ALA) intake from fruit and vegetables [highest vs. lowest quintile, hazard ratio (HR) 0.74; 95% confidence interval (CI) 0.63, 0.88; p trend < 0.0001], and from vegetable oils (HR 0.83; 95% CI 0.71, 0.97; p trend 0.017). Conversely, breast cancer risk was positively related to ALA intake from nut mixes (p trend 0.004) and processed foods (p trend 0.068), as was total ALA intake among women in the highest quintile of dietary vitamin E (p trend 0.036). A significant interaction was also found between omega-6 and long-chain omega-3 PUFAs, with breast cancer risk inversely related to long-chain omega-3 PUFAs in women belonging to the highest quintile of omega-6 PUFAs (p interaction 0.042). These results emphasize the need to consider food sources, as well as interactions between fatty acids and with antioxidants, when evaluating associations between PUFA intakes and breast cancer risk" - Note:  Alpha-linolenic acid is the vegetable form of omega-3.
  • Low plasma eicosapentaenoic acid and depressive symptomatology are independent predictors of dementia risk - Am J Clin Nutr. 2008 Sep;88(3):714-21 - "A high plasma EPA concentration may decrease the risk of dementia, whereas high ratios of n-6 to n-3 fatty acids and of AA to DHA may increase the risk of dementia, especially in depressed older persons. The role of EPA in dementia warrants further research" - See Mega Twin EPA at iHerb and Jarrow Max DHA at iHerb.
  • Very Low n-3 Long-Chain Polyunsaturated Fatty Acid Status in Austrian Vegetarians and Vegans - Ann Nutr Metab. 2008 Feb 28;52(1):37-47 - "The vegetarian diet, with an average n-6/n-3 ratio of 10/1, promotes biochemical n-3 tissue decline. To ensure physical, mental and neurological health vegetarians have to reduce the n-6/n-3 ratio with an additional intake of direct sources of EPA and DHA, regardless of age and gender" - See Mega Twin EPA at iHerb.
  • Depressive Symptoms, omega-6:omega-3 Fatty Acids, and Inflammation in Older Adults - Psychosom Med. 2007 Mar 30 - "Diets with high n-6:n-3 PUFA ratios may enhance the risk for both depression and inflammatory diseases"
  • Dietary Fatty acids correlate with prostate cancer biopsy grade and volume in jamaican men - J Urol. 2007 Jan;177(1):97-101 - "Omega6 polyunsaturated fatty acids stimulate and Omega3 polyunsaturated fatty acids inhibit prostate cancer growth"
  • Habitual Dietary Intake of n-3 and n-6 Fatty Acids in Relation to Inflammatory Markers Among US Men and Women - Circulation. 2003 Jun 23 - "These results suggest that n-6 fatty acids do not inhibit the antiinflammatory effects of n-3 fatty acids and that the combination of both types of fatty acids is associated with the lowest levels of inflammation. The inhibition of inflammatory cytokines may be one possible mechanism for the observed beneficial effects of these fatty acids on chronic inflammatory-related diseases" - See TwinLab Mega Twin EPA at iHerb or Vitacosticon.
  • Essential fatty acids and the brain - Can J Psychiatry 2003 Apr;48(3):195-203 - "The ratio of membrane omega-3 to omega-6 PUFAs can be modulated by dietary intake. This ratio influences neurotransmission and prostaglandin formation, processes that are vital in the maintenance of normal brain function"
  • Cognitive decline and fatty acid composition of erythrocyte membranes - Am J Clin Nutr. 2003 Apr;77(4):803-8 - "studied the relation between erythrocyte membrane fatty acid composition and cognitive decline in free-living volunteers ... Higher proportions of both stearic acid (saturated, 18:0) and total n-6 polyunsaturated fatty acids were associated with greater risk of cognitive decline ... Conversely, a higher proportion of total n-3 fatty acids was associated with a lower risk of cognitive decline"
  • Dietary Fats and the Risk of Incident Alzheimer Disease - Archives of Neurology, 2/03 - "Intakes of saturated fat and trans-unsaturated fat were positively associated with risk of Alzheimer disease, whereas intakes of -6 polyunsaturated fat and monounsaturated fat were inversely associated. Persons in the upper fifth of saturated-fat intake had 2.2 times the risk of incident Alzheimer disease compared with persons in the lowest fifth" - See the tables on my fatty acids page.  For example, palm oil is 51% saturated fat while canola oil is 8% saturated.

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