Warm colors, such as red and orange, are believed to cause people to feel hungry. Many fast food restaurants, such as McDonald's, Wendy's and Burger King, use these colors in their logo. Cool colors, such as blue and pur... More »

Red and yellow do make people hungry, according to research results. People eat more when they are surrounded by warm colors, such as yellow, orange and red. Cold colors, such as blue, purple and black, suppress the appe... More »

Iron pills can make people hungry by improving iron-deficiency anemia, which can cause poor appetite, according to azcentral.com. Except in cases of anemia, iron supplements are not known for increasing or decreasing hun... More »

Red and yellow do make people hungry, according to research results. People eat more when they are surrounded by warm colors, such as yellow, orange and red. Cold colors, such as blue, purple and black, suppress the appe... More »

A rainbow is caused by the sun hitting water droplets in the atmosphere and reflecting the light so that people see a spectrum of colors. Rainbows are bowed in the center due to the fact that rainbows result from a group... More »

The generally accepted number of colors of the rainbow is seven, although the rainbow has only six colors to many people, and others claim that the number of colors is infinite. Sir Isaac Newton used prisms to break down... More »

www.reference.com Science Colors

There are nearly an infinite number of colors, according to the Chester F. Carlson Center for Imaging Science at the Rochester Institute of Technology. However, not all of them are distinguishable by the human eye. More »