The use of color is not just a matter of personal preference.
Color affects people physically, emotionally and psychologically.
Has a calming effect, partly caused by the body producing naturally tranquilizing chemicals which relax and refresh. Because of this effect, blue creates a feeling of peace and trust. When red is predominant, heart rate increases, blood pressure rises and breathing can become more rapid. Red is also an appetite stimulant, which explains why it is frequently used in restaurants. When used as a good garnish, green compliments most food colors.