This paper assesses priorities for policy research dealing with nutrition interventions in primary health care programs in developing countries. Research and demonstration projects for "second best" growth-monitoring programs are needed, as are tests of the effectiveness of growth-monitoring and nutrition-education programs. Preventive measures of all kinds gain from association with highly valued curative services. Cost-effectiveness of feeding programs may be increased through coupon schemes and subsidized sale of food aid commodities. Programs to end micronutrient (iodine, vitamin A, iron) deficiencies appear to be highly cost-effective. Innovative methods and sites of delivery should be tested. Ways of building institutions that can sustain the needed applied research are discussed.