Recently published wisdom on the subject includes:
A cost-effectiveness analysis of public policies designed to increase fruit and vegetable consumption in the European Journal of Public Health. Its authors conclude that VAT reductions work better than food stamps in terms of life years saved and that information campaigns are the most cost-effective (no surprises there!). An earlier issue of EJPH also included findings from a panel discusion on monetary incentives in promoting healthy eating.
From New Zealand there's a study on the effects of a free school breakfast programme on attendance, achievement, nutrition and wellbeing.
There's also a protocol for a study in promoting a healthy diet and physical activity in adults with learning disabilities (from BMC).
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