Context: Dietary deficiencies in developing countries can be combated by promoting better eating practices. Supplementation with vitamin A and/or zinc. Zinc supplementation proved successful showing a significant decrease in the incidence of diarrheal disease compared to a control group. The majority of the literature suggests that vitamin A supplementation is advantageous in reducing disease incidence. Development of a supplementation strategy should take into consideration the fact that vitamin A supplementation was less effective in reducing diarrhea incidence when compared to vitamin A and zinc supplementation, and that the latter strategy was estimated to be significantly more cost effective.

Question: What can be done to combate dietary deficiences?
Answer: promoting better eating practices

Question: What has been used and shown successful in a decrease in incidence of diarrheal disease?
Answer: Zinc

Question: WHat strategy was found out to be more cost effective?
Answer: zinc supplementation

Question: How can zinc deficiencies be combated?
Answer: Unanswerable

Question: What strategy showed a decrease in the incidence of dietary deficiencies?
Answer: Unanswerable

Question: What dietary deficiency was found to be less effective in reducing diarrhea incidence?
Answer: Unanswerable

Question: What actions help combat diarrhea?
Answer: Unanswerable

Question: What control group was found to be more cost effective?
Answer: Unanswerable