• Heidi Zweers, Debbie Smit, Susanne Leij, Geert Wanten, and Mirian C H Janssen.
• Radboudumc, Nijmegen, The Netherlands. Electronic address: Heidi.Zweers-vanEssen@radboudumc.nl.
• Nutrition. 2020 Jan 1; 69: 110544.

ObjectiveThe aim of this study was to evaluate the effect of an individually tailored dietary intervention on personalized goals, body composition (BC), functioning, and quality of life (QoL) in adult patients with mitochondrial disease (MD) due to the m.3243 A>G mutation.MethodsThis explorative randomized controlled trial included 39 patients with MD. The intervention group (n = 20) received an individually tailored dietary intervention over a 6-mo period. The control group (n = 19) received standard care over a 6-mo timeframe (control period), followed by an individually tailored dietary intervention for the next 6 mo (intervention period). Nutritional assessment and QoL measurements were performed at 3-mo intervals. Personalized treatment goals of the patients with MD were evaluated at 3 and 6 mo during the dietary intervention. Achievement of the personalized goals was assessed using descriptive statistics and mixed models. Linear mixed models were used to test the effect of the dietary intervention on continuous outcomes.ResultsThe personal goals of patients were significantly more frequently achieved in the intervention group than in the control group. After 3 mo of intervention, 57% of the goals were achieved. Most goals were achieved for BC, handgrip strength (HGS), and gastrointestinal complaints. Intervention increased HGS (P = 0.037), the vitality component of QoL (P = 0.026), and decreased the fatigue score (P = 0.024) after 3 mo of treatment. Effects did not seem to last after 3 mo, however.ConclusionAn individually tailored dietary intervention is promising to achieve personalized goals of patients with MD, especially with regard to BC, HGS, and gastrointestinal complaints. The intervention also improves QoL, and decreases fatigue.Copyright © 2019 Elsevier Inc. All rights reserved.

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