Analysis of a healthy eating and activity programme first tested in Waikato primary schools shows the project is saving taxpayer money and improving children's lives.
The obesity research findings show Project Energize will improve the health and quality of life of the 44,000 children involved.
The data, published in the British Journal of Nutrition, showed the prevalence of obesity among all children involved was 15 per cent less than for Waikato children not in the programme in 2004 and 2006.
Children participating in Project Energize could run 550m 10 per cent faster than children from another region and their body mass index was reduced by 3 per cent.
The project, where a team of 27 "energizers" train school teachers and children in healthy eating and activities across Waikato primary schools, began in 2004. The annual $2 million programme is funded by Waikato District Health Board and implemented by Sport Waikato.