Wear different colors to suit different moods. Pale blue helps you daydream. People believe that pastries and candies from a pink box taste better. People eat less from blue plates. People won't buy ice cream in red cartons because they associate red with heat.
Yellow signals caution and carefulness.
People feel safe and secure around green because there's so much green in nature. Red makes you eat more. Most Americans pick blue as their favorite color. After that comes red, green, white, pink, purple, orange, and yellow.