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Fatty Acid Index – Meaning, Measurement & Values

The fatty acid index is a biomarker that describes the ratio of different fatty acids in the blood or tissue, providing insights into nutritional quality and cardiovascular risk.

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Things worth knowing about "Fatty acid index"

The fatty acid index is a biomarker that describes the ratio of different fatty acids in the blood or tissue, providing insights into nutritional quality and cardiovascular risk.

What is the Fatty Acid Index?

The fatty acid index (also referred to as fatty acid profile or fatty acid status) is a diagnostic measurement that describes the composition and ratio of various fatty acids in the blood, cell membranes, or tissue. It provides information about how well the body is supplied with essential fatty acids and allows conclusions to be drawn about nutritional quality and the risk of various chronic diseases.

The most well-known form is the Omega-3 Index, which measures the proportion of the omega-3 fatty acids EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) as a percentage of total fatty acids in red blood cells (erythrocytes).

Which Fatty Acids Are Measured?

A comprehensive fatty acid analysis can determine several fatty acid groups:

Saturated fatty acids (SFA): e.g., palmitic acid, stearic acid – mainly found in animal fats
Monounsaturated fatty acids (MUFA): e.g., oleic acid – found in olive oil and avocados
Polyunsaturated fatty acids (PUFA): including omega-3 and omega-6 fatty acids
Trans fatty acids: formed during the industrial hydrogenation of fats and considered harmful to health

Clinical Significance

A balanced fatty acid profile is closely linked to the health of the cardiovascular system, brain, immune system, and cell membranes. An unfavorable ratio of omega-6 to omega-3 fatty acids – as is common in the Western diet – has been associated with an increased risk of:

Cardiovascular diseases (e.g., heart attack, stroke)
Chronic inflammatory conditions (e.g., rheumatoid arthritis, inflammatory bowel disease)
Metabolic syndrome and type 2 diabetes
Depression and neurodegenerative disorders

The Omega-3 Index as the Most Important Fatty Acid Index

The Omega-3 Index is considered one of the most informative biomarkers for assessing cardiovascular risk. The following reference values are cited in the scientific literature:

Below 4%: high cardiovascular risk
4 – 8%: moderate risk; optimization recommended
8% and above: low risk; optimal supply status

In many Western countries, the average Omega-3 Index of the general population falls between 5 and 6%, indicating widespread suboptimal intake.

Diagnosis and Measurement

The fatty acid index is determined via a blood test. Whole blood, plasma, or an erythrocyte fraction is analyzed. The measurement is performed using gas chromatography, a laboratory technique that enables precise separation and quantification of individual fatty acids. This test is not part of routine laboratory diagnostics and is therefore often offered as a private health service.

Influence of Diet and Lifestyle

The fatty acid index can be positively influenced through targeted dietary changes and supplementation:

Regular consumption of fatty fish (e.g., salmon, mackerel, herring) to increase omega-3 intake
Use of flaxseed oil, chia seeds, and walnut oil as plant-based omega-3 sources
Reduction of omega-6-rich vegetable oils (e.g., sunflower oil, corn oil)
Supplementation with omega-3 fish oil or algae oil products in cases of confirmed deficiency
Avoidance of trans fatty acids by limiting consumption of highly processed foods

References

Harris, W. S. & Von Schacky, C. (2004): The Omega-3 Index: a new risk factor for death from coronary heart disease? In: Preventive Medicine, 39(1), 212–220.
World Health Organization (WHO): Diet, Nutrition and the Prevention of Chronic Diseases. WHO Technical Report Series 916, Geneva, 2003.
Calder, P. C. (2015): Functional roles of fatty acids and their effects on human health. In: Journal of Parenteral and Enteral Nutrition, 39(1 Suppl), 18S–32S.

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