No studies have examined the relationship between endogenous polyunsaturated fatty acids (PUFAs) levels and treatment response to PUFAs. We conducted a 12-week, double-blind, placebo-controlled trial comparing the effects of high-doseeicosapentaenoicacid (EPA, 1.2 g) and placebo on cognitive function (continuous performance test) in n = 92 youth (age 6-18-years-old) with Attention Deficit Hyperactivity Disorder (ADHD).
Blood erythrocytes PUFAs were measured before and after treatment, to examine the effects of baseline endogenousEPAlevels on treatment response and the effects of EPA treatment on PUFAs levels. Secondary measures included other ADHD symptoms, emotional symptoms, and levels of plasma high-sensitivity c-reactive protein (hs-CRP) and brain-derived neurotrophic factor (BDNF).
Overall, EPA group improved more than placebo group on focused attention (variability, Effect size (ES) = 0.38, p = 0.041); moreover, within youth with the lowest baseline endogenousEPAlevels, EPA group improved more than placebo group in another measure of focused attention (hit reaction time, HRT, ES = 0.89, p = 0.015) and in vigilance (HRT interstimulus interval changes, HRTISIC, ES = 0.83, p = 0.036).
Interestingly, EPA group improved less than placebo group in impulsivity (commission errors), both overall and in youth with the highest baseline EPAlevels, who also showed less improvement in other ADHD and emotional symptoms. EPA increased blood erythrocytes EPA by 1.6-fold but not DHA levels, and did not affect hs-CRP and BDNF plasma levels.
In conclusion, EPA treatment improves cognitive symptoms in ADHD youth, especially if they have a low baseline endogenousEPA level, while youth with high EPAlevels may be negatively affected by this treatment.
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