Ever wonder why so many fast food places use the red spectrum in their color schemes? It is simply that the warm colors, red, orange and yellow, tend to increase hunger. This is probably due to the fact that warm colors excite us and since excitement tends to burn energy, it would automatically lends itself to causing and increase in hunger.
Obviously if you are trying to lose weight, you do not want to paint your dinning room red. This could be why most of the homes and kitchens you see in cooking programs and magazine have red kitchens and/or dinning rooms. After all, one of the major sponsors of cooking programs is various aspects of the food industry, so again, you can see how serious big business takes things when dealing with color.