Guide to Omega-6:Omega-3 Ratio

WRITTEN BY

The Levels Team

Updated: 05/22/2025|12 min read

Summary

The omega-6 to omega-3 ratio indicates the balance between competing essential fatty acids in your body.

Why It Matters

The omega-6 to omega-3 ratio is a marker of metabolic health and inflammation in your body. This ratio reflects the balance between two types of essential fatty acids: omega-6 and omega-3, which are both polyunsaturated fats.

Omega-6 fatty acids are necessary for the health and function of cells in the body, but having too much omega-6 fatty acids may promote inflammation.

The most common omega-6 fatty acids in our diet include:

• Linoleic acid (LA)
• Arachidonic acid (AA)

Omega-3 fatty acids, on the other hand, help reduce inflammation. Omega-3s are thought to support several areas of health, including brain function, heart health, and the immune system.

The most common omega-3 fatty acids in our diet include:

• Alpha-linolenic acid (ALA)
• Eicosapentaenoic acid (EPA)
• Docosahexaenoic acid (DHA)

Though the research is mixed, having the right balance between the two types of fatty acids may be important. Both types of fatty acids compete for the same enzymes in your body, meaning that the ratio may influence how effectively your body can use each type.

When omega-6 levels are high compared to omega-3 levels, the balance may tip toward a pro-inflammatory state. Chronic inflammation may increase the risk of several health conditions, including cardiovascular disease, autoimmune disorders, and cancer.

This isn’t about omega-6s being “bad.” Both types of these fatty acids are necessary and can be protective when balanced. Rather, understanding your ratio helps guide dietary choices toward better balance, focusing on getting omega-3s from sources like fatty fish and reducing omega-6s from processed sources while maintaining healthy whole-food sources like nuts and seeds.

Clinical Ranges

Lab Reference Range: 3.7-14.4

Lifestyle Factors That Can Impact Your Ratio

Factors that can improve your ratio:

• Fatty fish consumption provides direct EPA/DHA omega-3s that bypass conversion competition.
• Whole-food omega-6 sources (nuts and seeds like walnuts, pine nuts, sunflower seeds) provide beneficial nutrients alongside their fatty acids.
• A Mediterranean diet pattern naturally provides better fatty acid balance with protective compounds.
• Olive oil usage reduces processed seed oil intake while providing stable cooking fats.
• Balanced cooking methods avoid high-heat processing that can oxidize fragile fatty acids.

Factors that can make your ratio worse:

• Deep frying with seed oils creates potentially harmful oxidation products.
• Frequent processed food consumption provides concentrated omega-6 without protective nutrients.
• Poor-quality oils (canola, rapeseed, corn oil) may be rancid or degraded from improper storage.
• Repeated heating of polyunsaturated fats increases harmful compounds.
• Exclusive focus on reduction rather than balance could miss the benefits of essential fatty acids.

Supplementation Considerations

You should always consult with a doctor or healthcare professional before using a supplement. Below are some suggestions they might make.

Fish Oil/EPA/DHA:

• Quality matters: some brands utilize third-party testing
• Typical effective dose: 1000-2000 mg combined EPA/DHA daily
• Often taken with meals containing fat for better absorption
• Proper storage (cool, dark place) is important to prevent rancidity
• Algae-based versions are available for vegetarians

Important cautions:

• High doses (>3000mg daily) require medical supervision
• Can interact with blood-thinning medications
• Quality varies widely between brands
• More isn’t necessarily better; ask your doctor about recommended doses

Potential alternatives to supplementing:

• Reducing processed seed oil intake
• Increasing fatty fish consumption (2-3 servings weekly)
• Adding whole-food omega-3 sources (walnuts, flax, chia)
• Considering fish oil only if unable to get enough from food
• Using olive oil or avocado oil for cooking

Other Factors That Can Impact Your Ratio

Genetic Factors

• FADS1 and FADS2 gene variations affecting fatty acid metabolism
• Genetic variations in omega-3 absorption and conversion
• Individual differences in inflammatory response

How it Relates to Other Markers

• ApoB and Particle Size: Omega-3s may help reduce ApoB and shift LDL particles toward larger, less atherogenic sizes. The ratio can provide context for unexpected lipid patterns.
• Inflammatory Markers: C-reactive protein (CRP) and other inflammatory markers may help distinguish whether an elevated ratio is actively promoting inflammation or being buffered by other protective factors.
• Triglycerides: Omega-3s directly impact triglyceride metabolism, often lowering levels. The ratio can help explain why triglycerides might not respond as expected to standard interventions.
• HDL Cholesterol: Both types of fatty acids influence HDL function, with omega-3s mainly supporting HDL’s anti-inflammatory properties.
• Glucose and Insulin: The balance of fatty acids can affect insulin sensitivity and glucose regulation, making this ratio relevant when investigating metabolic patterns.

Testing Accuracy and Stability

Factors That Can Affect the Accuracy of Your Test

• Having a recent meal (especially high-fat meals)
• Acute inflammation or illness
• Recent intense exercise
• Dehydration
• Recent alcohol consumption

Best Practices for Testing

• Follow laboratory instructions (for example, fasting for 12 hours before testing)
• Avoid omega-6 and omega-3 supplements for 24-48 hours before testing
• Maintain a normal diet in the week leading up to testing
• Avoid intense exercise 24 hours before testing
• Inform the laboratory about all current medications and supplements

Follow-up Considerations

You should always talk to your doctor if you have medical concerns or questions.

When Re-Testing May Be Appropriate

• Retesting every 3-6 months may be appropriate if you are making dietary changes

Additional Testing Your Doctor May Consider

• Complete fatty acid profile
• Oxidative stress markers
• Fat absorption testing, if indicated
• Advanced inflammatory panels
• Lipid peroxidation markers

Bibliography