Red is such a strong color, and it is used for so many purposes – always to drive people to some kind of action. As I wrote in The Beader’s Guide to Color:
“Red is the passionate call to action: buy this product! stop your car! exit here! do not smoke! stand up and fight! indulge in this pleasure! you’re bleeding, DO something!
Red demands attention, broadcasts danger, commands strength, declares devotion, quickens the heartbeat, incites aggression, inflames passion, and proclaims love.”
The ColorSchemer Blog posts an interesting, informative entry on the use of red in the logos of stores and restaurants that sell food. I think you’ll find it valuable: