**Acknowledgments**

We are grateful to the young men who participated in this study, many of whom showed great dedication and perseverance. We acknowledge Maria Webb and Heather Webb for assistance with recruitment, Wathsala Kumarasinghe for the diet analysis, Jo Kepple for the use of Primorus Clinical Trials Unit, Lynley Drummond for consultation on study design, and John Pearson for consultation on statistical power. Role of each author: A.C.C. study design, recruitment, study co-ordination, sample processing, data analysis, writing manuscript; S.B. recruitment, sample processing and analysis, editing manuscript; J.P. editing manuscript; J.S. muscle biopsies, editing manuscript; M.C.M.V. study design, sample processing, editing manuscript. Sources of support included University of Otago, Dunedin, New Zealand and Zespri International Ltd., Mount Maunganui, New Zealand.
