Bright colours like -yellow, orange, and red, are known to stimulate our appetites the most. These colours, especially red, increase our blood pressure and heart rate, making us feel more hungry. However, grey, black, brown, and purple are considered as an appetite suppressant. By having food in plates of these colours, the chances of overeating decreases. The blue colour is considered the best among all. Science suggests that eating in the dark blue plate can help you control the portion size in a better way.