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Interactions of parasitic diseases and nutrition: some policy implications.

The scientist's concern for precision in the use of information contrasts sharply with the policymaker's need to make decisions based on limited knowledge. Researchers should assist in the adaptation and presentation of their findings to meet policy requirements. Understanding of the policy process should reduce frustration about how information is used. Examples from the interaction of parasitic diseases and nutrition illustrate the limited but critical role of research findings in the determination of policies and related recommendations for action.