Guide to Omega‑6 Total

WRITTEN BY

The Levels Team

Updated: 05/22/2025|12 min read

Summary

Omega-6 fatty acids are essential nutrients that support immune function, brain development, and skin health. Testing total omega-6 levels helps evaluate whether you have a healthy balance with omega-3 fatty acids, which influences the inflammatory response and overall metabolic health.

Why It Matters

Omega-6 fatty acids are vital for health: They help maintain the structural integrity of cell membranes, regulate gene expression, support brain development, and are crucial for normal growth and reproduction. Because your body can't produce these fats, they must come from your diet. The most common omega-6 is linoleic acid, which your body can convert to other forms like arachidonic acid.

However, the balance between omega-6 and omega-3 fatty acids is important. Both types produce bioactive compounds called eicosanoids that influence inflammation, blood pressure, and immune function. Generally, omega-6-derived compounds tend to be more pro-inflammatory (though some are anti-inflammatory), while omega-3-derived compounds tend to be more anti-inflammatory.

Research suggests that humans evolved consuming omega-6 and omega-3 fatty acids in a ratio closer to 1:1 or 2:1. Modern Western diets typically provide ratios ranging from 10:1 to 20:1 or higher (Simopoulos, 2016), with some estimates showing average ratios of 15:1 to 17:1 (Simopoulos, 2002). While the optimal ratio is still debated among researchers, most agree that the current high intake of omega-6s relative to omega-3s is not ideal for inflammatory balance.

Measuring total omega-6 levels, especially in relation to omega-3 levels, provides insight into your fatty acid balance and potential inflammation risk. Most Americans consume more omega-6 fatty acids than is recommended. As much as 90% of omega-6 intake comes from foods rich in linolenic acid, from nuts, seeds, and vegetable oils (canola, soybean, corn, cottonseed) used in processed and restaurant foods.

Associated Symptoms

Abnormal omega-6 levels themselves typically don't cause direct symptoms. However, an imbalance in the omega-6 to omega-3 ratio may contribute to various health conditions, with possible symptoms such as:

• Increased inflammation
• Joint pain
• Dry flaky skin, and impaired wound healing

Low omega-6 levels are generally not a clinical concern in developed countries due to the abundance of these fatty acids in the modern diet. Very low levels are rarely seen outside of malnutrition.

Lifestyle Factors That Can Impact It

Activities that may help balance the omega-6 to omega-3 ratio include the following:

• Increasing consumption of omega-3-rich foods (fatty fish, flaxseeds, chia seeds)
• Choosing grass-fed over grain-fed animal products
• Eating more whole foods, especially leafy greens and beans

Activities that may increase omega-6 levels include the following:

• Consuming ultra-processed foods with vegetable oils (soybean, corn, sunflower, cottonseed) or cooking with vegetable oils
• Regularly consuming fried foods
• Snacking on ultra-processed baked goods and chips

Other Factors That Can Impact It

Note that a condition cannot literally change the omega6:omega3 ratio, but it can compound any undesirable effects from a ratio that's too high, or could exacerbate issues even if the ratio is normal.

Medical Conditions

• Metabolic syndrome: Alters fat metabolism and promotes inflammation
• Inflammatory conditions: Can elevate omega-6 derivatives as the body releases pro-inflammatory compounds
• Liver disease: Decreases efficient conversion of linoleic acid (an omega-6) to other active omega-6 fatty acids due to impaired enzyme function
• Genetic FADS (fatty acid desaturase) variations: Increase or decrease the body's ability to convert linoleic acid to arachidonic acid
• Diabetes: Compounds omega-6 inflammatory responses through altered fat metabolism and increased oxidative stress

Medications

• Statins: May increase omega-6 conversion to inflammatory compounds by favoring key enzymes in the metabolic pathway
• Corticosteroids: Alters fat distribution and metabolism
• Some diabetes medications: Improving insulin sensitivity and normalizing lipid metabolism
• NSAIDs: Block the conversion of omega-6 fatty acids to inflammatory compounds, reducing their biological effects
• Antipsychotic medications: Can increase omega-6 levels through altered lipid metabolism and weight gain
• Weight loss medications: Can decrease omega-6 levels by inhibiting fat absorption in the intestines

Testing Accuracy and Stability

Total omega-6 testing provides a more comprehensive measurement than individual tests, but a few factors can affect results. 

Factors That Can Affect the Accuracy of Your Test

• Consuming foods high in omega-6 in the days before testing can elevate results.
• Testing method differences can yield varying results. Plasma measurements reflect recent intake (hours) of omega-6s and can be higher after consuming high amounts of  omega-6 foods. Red blood cell measurements average approximately 12-16 weeks of intake.

How It Relates to Other Markers

Your healthcare provider may interpret omega-6 levels alongside other fatty acid and metabolic markers such as:

• Omega-3 level: A low omega-3 index with high total omega-6 increases inflammatory risk significantly.
• Inflammatory markers (C-reactive protein, interleukin-6): Elevated omega-6 to omega-3 ratios may correlate with higher inflammatory markers in research studies.
• Triglycerides: High omega-6 intake, especially from ultra-processed foods, in relation to omega-3 can increase triglyceride levels through effects on lipid metabolism.
• Low-density lipoprotein (LDL) and high-density lipoprotein (HDL) cholesterol: Linoleic acid can decrease LDL slightly, especially compared to a high saturated fat intake. However, the positive effect may be neutralized when linoleic acid is consumed as ultra-processed foods high in refined carbohydrates.
• Arachidonic acid levels: High arachidonic acid (converted from linoleic acid) directly increases production of inflammatory compounds and may predict inflammatory disease risk better than total omega-6.

What Results May Mean in the Context of Other Markers

• High omega-6 with low omega-3 index: Can reflect a classic Western diet pattern associated with increased inflammatory potential; dietary intervention to increase omega-3 and whole foods may be recommended.
• High omega-6 with normal omega-3 index: Can still represent an imbalanced ratio; healthcare professionals may suggest increasing omega-3 consumption.
• High omega-6 with elevated inflammatory markers: Suggests fatty acid imbalance may be contributing to systemic inflammation; addressing the ratio through diet may help reduce inflammation.
• Normal omega-6 with low omega-3: Your doctor may advise focusing on increasing omega-3 intake.
• High omega-6 with elevated triglycerides: May indicate metabolic issues related to excessive refined carbohydrates and omega fatty acid imbalance.
• Normal omega-6 to omega-3 ratio with elevated inflammatory markers: Inflammation may be driven by factors other than fatty acid balance.

Follow-up Considerations

If your omega-6 to omega-3 ratio is high, your provider may work with you on a plan to address this. Here are some recommendations they might make. You should always speak to your doctor if you have medical questions or before making medical decisions.

When Re-Testing May be Appropriate

• Routine monitoring: Annually
• After dietary interventions: 3--6 months
• With new inflammatory symptoms: As clinically indicated
• When evaluating effectiveness of omega-3 supplementation: 3--4 months after starting

Additional Testing Your Doctor May Consider

• Complete fatty acid profile
• Inflammatory markers
• Metabolic markers (insulin, glucose)
• Oxidative stress markers

When Additional Care May be Warranted

• Extremely high omega-6 to omega-3 ratio (>20:1)
• Elevated inflammatory markers with high omega-6 to omega-3 ratio
• Persistent inflammatory conditions despite dietary changes
• Abnormal omega-6 levels with unexplained systemic symptoms
• Difficulty achieving balanced fatty acid levels despite dietary efforts

Further Reading

Why omega 3s are crucial to strong metabolic health

Bibliography