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A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
Published on: September 20, 2019
Virtual non-compliance with Omega-3 treatment results in null effects: The RANGER study
William S Harris1, Daniel T Johnston2
1Department of Internal Medicine, Sanford School of Medicine, University of South Dakota; and the Fatty Acid Research Institute, Sioux Falls, SD, USA.
Abstract:
A recent paper reported that 14 weeks of treatment with 2100 mg of EPA+DHA from krill oil had no effect on cognitive function in US Army Ranger trainees. Although the authors stated that poor compliance "may have contributed to a failure to detect a response," no indication of exactly how poor the compliance was is given. We have therefore calculated, based on their reported blood EPA+DHA levels and published equations predicting how a given dose of EPA+DHA should affect erythrocyte EPA+DHA levels (i.e., the Omega-3 Index), that the effective compliance was actually <3%. This study underscores the importance of adhering to ISSFAL recommendations that baseline and end of study blood Omega-3 levels always be reported in intervention studies. In this case the observed changes in blood levels are critical for interpreting the findings: there was no effect because there was essentially no intervention.
