The Journal of the American Dietetic Association has a paper ((Impact of garden-based youth nutrition intervention programs: A review. Journal of the American Dietetic Association, Volume 109, Issue 2, Pages 273-280. R. Robinson-O’Brien, M. Story, S. Heim.)) which goes all meta on projects which aimed to encourage kids to eat more fruit and vegetables by getting them to work in gardens, for example at school. It covers the period 1990-2007, but only US-based studies, alas. I’m trying to get hold of the paper, but from the abstract it seems that the best that can be said about such interventions is that they may have a nutrition impact. We have blogged about how people are using school gardens etc. to educate yoofs about the importance of agrobiodiversity: it’s kind of sad to see that it is not entirely clear if the message is getting through.