Evidence check: Omega-3 Index in the context of Müdigkeit

The Omega-3 Index measures EPA+DHA in red blood cell membranes and is a validated biomarker for long-term omega-3 status. Low levels (<4%) have been associated with increased fatigue, poorer cognitive function, and mood disturbances in observational studies, but the evidence is moderate and not consistently causal. Some randomized trials show modest fatigue reduction with omega-3 supplementation, especially in individuals with low baseline levels, but effects vary. The index is not a diagnostic test for fatigue; it indicates a potential nutritional risk factor. Fatigue has many causes (sleep, iron, thyroid, stress, depression) that are often more impactful. Raising the index through diet or supplements is possible, but may not resolve fatigue if other factors dominate. High doses (>3 g/day) can increase bleeding risk – consult a physician. The test is useful as part of a broader assessment, not a standalone solution.