The basis of nutrition is good methodology. The November edition of the International Journal of Obesity is devoted to methodology in large studies of Adolescent Nutrition.
Branca , Popkin , Simopoulos ( 2008 ) Healthy Lifestyle in Europe by Nutrition in Adolescence (HELENA) Study: Methodological aspects .International Journal of Obesity Volume 32, Issue S5 (November 2008)

1. Design and implementation of the Healthy Lifestyle in Europe by Nutrition in Adolescence Cross-Sectional Study.
2. Quality assurance of ethical issues and regulatory aspects relating to good clinical practices in the HELENA Cross-Sectional Study.
3. Socioeconomic questionnaire and clinical assessment in the HELENA Cross-Sectional Study: methodology.
4. Development and evaluation of a self-administered computerized 24-h dietary recall method for adolescents in Europe.
5. Food and nutrient intake, nutritional knowledge and diet-related attitudes in European adolescents
6. Concurrent validity of a modified version of the International Physical Activity Questionnaire (IPAQ-A) in European adolescents: The HELENA Study
7. Reliability of health-related physical fitness tests in European adolescents. The HELENA Study.
8. Harmonization process and reliability assessment of anthropometric measurements in a multicenter study in adolescents.
9. Sampling and processing of fresh blood samples within a European multicenter nutritional study: evaluation of biomarker stability during transport and storage
10. A feasibility study of using a diet optimization approach in a web-based computer-tailoring intervention for adolescents

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