title: Effectiveness of agricultural interventions that aim to improve nutritional status of children: systematic review.
abstract: OBJECTIVE
  To assess the effectiveness of agricultural interventions in improving the nutritional status of children in developing countries.
  
  
  METHODS
  Systematic review.
  
  
  METHODS
  Published and unpublished reports (after 1990) in English identified by searching 10 databases (Agris, Econlit, Eldis, IBSS, IDEAS, IFPRI, Jolis, PubMed, Web of Science, and World Bank), websites, previous systematic reviews, and reference lists and by contacting experts.
  
  
  METHODS
  Included studies assessed effects of agricultural interventions aiming at improving the nutritional status of children (bio-fortification, home gardens, small scale fisheries and aquaculture, dairy development, and animal husbandry and poultry development). Only studies that used a valid counterfactual analysis were included. Before/after studies and participants/non-participants comparisons affected by selection bias were excluded. Data analysis Results were analysed for four intermediate outcomes (programme participation, income, dietary diversity, and micronutrient intake) and one final outcome (prevalence of under-nutrition). Analysis was by summary tables of mean effects and by meta-analysis (for vitamin A absorption).
  
  
  RESULTS
  The review included 23 studies, mostly evaluating home garden interventions. The studies reviewed did not report participation rates or the characteristics of participants in programmes. The interventions had a positive effect on the production of the agricultural goods promoted, but not on households' total income. The interventions were successful in promoting the consumption of food rich in protein and micronutrients, but the effect on the overall diet of poor people remains unclear. No evidence was found of an effect on the absorption of iron, but some evidence exists of a positive effect on absorption of vitamin A. Very little evidence was found of a positive effect on the prevalence of stunting, wasting, and underweight among children aged under 5.
  
  
  CONCLUSIONS
  The question posed by the review cannot be answered with any level of confidence. The data available show a poor effect of these interventions on nutritional status, but methodological weaknesses of the studies cast serious doubts on the validity of these results. More rigorous and better designed studies are needed, as well as the establishment of agreed quality standards to guide researchers in this important area.
authors.affiliation: Institute of Development Studies, University of Sussex, Brighton BN1 9RE, UK. e.masset@ids.ac.uk
authors.forename: Edoardo
authors.initials: E
authors.lastname: Masset
authors.forename: Lawrence
authors.initials: L
authors.lastname: Haddad
authors.forename: Alexander
authors.initials: A
authors.lastname: Cornelius
authors.forename: Jairo
authors.initials: J
authors.lastname: Isaza-Castro
mesh_terms: D000383:Agriculture; D002648:Child; D003906:Developing Countries; D004032:Diet; D006293:Health Promotion; D006801:Humans; D007182:Income; D044342:Malnutrition / Q000517:prevention & control*; D018977:Micronutrients; D009752:Nutritional Status
chemical_list: D018977:Micronutrients