The authors of this article begin with what seems like a basic question: Are there enough fruits and vegetables being supplied to meet nutrition recommendations? Pulling from data sources published through FAO and WHO, they estimate a 22% global supply gap (average) between what is produced and what is needed. The authors point out significant variation by country and income levels, and the need to address policy levers that can prevent widening gaps in fruit and vegetable availability.
Siegel, KR., Ali, MK., Srinivasiah, A., Nugent, RA., Narayan, KMV. PLoS ONE. (August 2014) Vol. 9, No. 8, e104059.