All signs point to health: Arrows on grocery floors increased the proportion of produce spending: Consumers spent a greater proportion of their food budget on fruits and vegetables without increasing overall budgets -- ScienceDaily

This is an awesome study that shows that in store signage makes a difference. It also shows that people don't end up spending more money. This may be a deterrent for grocery stores to implement such signage, since they make more on processed foods than fresh produce, but hopefully they will do the right thing!