BACKGROUND: An Elimination Diet (ED) or Healthy Diet (HD) may be effective in reducing symptoms of Attention-Deficit/Hyperactivity Disorder (ADHD), but long-term maintenance effects and feasibility have never been examined. METHODS: One-year prospective follow-up of a sample of 165 children (5-12 years) with ADHD randomized (unblinded
1:1) to 5 weeks treatment with either ED ( RESULTS: At 1 year follow-up, 24% of the participants still complied with the ED and 37% still complied with the HD. In the ED (+CAU) trajectory, fewer participants showed (partial) improvement after 1-year prospective follow-up compared to the HD (+CAU) trajectory (47% vs. 64%, χ CONCLUSIONS: In line with the short-term effects, prospective 1-year follow-up outcomes are in favor of treatment with HD and not ED. Initial 5-week treatment with HD and if needed/preferred followed by CAU may reduce psychostimulant use without negatively impacting 1-year outcomes.