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 »

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 »

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 mixed together make the color orange. Red and yellow are both considered primary colors, which means that they cannot be created by mixing two other colors. Blue is the only other primary color. More »

www.reference.com Science Colors

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 is a primary color, so it is not usually possible to produce it by mixing two or more colors. However, print technology uses alternative primary colors, and an overlapping of magenta and yellow produces red. More »

Red has a number of shades, ranging from baby pink to dark sienna. Many home improvement stores stock color cards with different categories of red to help people find the perfect part of the spectrum the want. More »

www.reference.com Science Colors