Yellow might be less common, but many fast food chains have red in their logo, and it's not entirely clear whether this goes beyond the fact that this particular color is eye-catching.

In 1989, a triangle was added under the first "a" in the name, with the name appearing in combinations of black, yellow, and white. The type was once again stretched vertically, making it look taller.

There's a sneaky reason why you always see red and yellow on fast food logos. ... Red and yellow aren't the only colors used to influence consumers. Green and yellow can also impact how people feel.

In 1989, a triangle was added under the first "a" in the name, with the name appearing in combinations of black, yellow, and white. The type was once again stretched vertically, making it look taller.