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 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 purchaserprovider 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 feeforservice basis from private providers