This represents a significant increase from estimates a decade earlier. Overweight and obesity problems among children and adolescents greatly increase the risk of being overweight and obese in adulthood. Nearly all aspects of the public system - planning, organisation, administration and regulation - are highly centralised whereas the private sector is fragmented. Under the proposed new national health system (Box 1), there will be one purchaser (the Health Insurance Organisation), an autonomous public provider and several private providers who will have the option to contract with the Health Insurance Organisation. Purchaser-provider relations between the public and private sectors already exist in the current system on a limited basis when the public sector purchases services, mainly on a fee-for-service basis, from private providers.