"The prevalence of plant food allergies: a systematic review."
by Laurian Zuidmeer, Klaus Goldhahn, Roberto J Rona, David Gislason, Charlotte Madsen, Colin Summers, Eva Sodergren, Jorgen Dahlstrom, Titia Lindner, Sigurveig T Sigurdardottir, Doreen McBride, Thomas Keil
http://www.mendeley.com/research/prevalence-plant-food-allergies-systematic-review-1/CONCLUSION: Population-based prevalence estimates for allergies to plant products determined by the diagnostic gold standard are scarce. There was considerable heterogeneity in the prevalence estimates of sensitization or perceived allergic reactions to plant food.