Objective: The nutritional effect of YYB (a complimentary food supplement) needs to be systematically reviewed and analyzed that would serve as evidences for further development of YYB project in poor rural regions in China as a government supported national project.
Method: Medline, PubMed, Cochrane Library, CNKI and other sources of nutrition and health information were retrieved with the predetermined key words. The quality of the obtained literatures was evaluated with the criteria established in this study. RveMan 5.3 was used in the meta analysis. Results: Thirteen groups of qualified data from nine YYB intervention studies were used.
Result: The results showed that YYB significantly increased the level of Hb ( MD=0. 94, 95% CI 0.94-1.15, P< 0. 01),reduced the prevalence of anemia ( RR= 0.34, 95% CI 0.25-0.46,P<0. 01). YYB showed no significant effect on WAZ and HAZ, but significant increase of WHZ was demonstrated by the analytical data ( MD=0. 42, 95% CI 0. 19-0.65, P<0. 01). Additionally YYB intervention groups also showed lower prevalence of underweight (RR= 0. 53, 95% CI 0.32- 0. 88, P< 0. 05).
Conclusion: As an infant complementary food supplement, YYB improved the nutrition status of infants and young children including increased Hb level, declined anemia prevalence and wasting rate.