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Objectives: To implement a school based health promotion programme aimed at reducing risk factors for obesity and to evaluate the implementation process and its effect on the school.

Design: Data from 10 schools participating in a group randomised controlled crossover trial were pooled and analysed.

Setting: 10 primary schools in Leeds.

Participants: 634 children (350 boys and 284 girls) aged 7-11 years.

Main outcome measures: Response rates to questionnaires, teachers' evaluation of training and input, success of school action plans, content of school meals, and children's knowledge of healthy living and self reported behaviour.

Results: All 10 schools participated throughout the study. 76 (89%) of the action points determined by schools in their school action plans were achieved, along with positive changes in school meals. A high level of support for nutrition education and promotion of physical activity …