Why do most fast food restaurants use red in their logos?

This is a great question. I was told in the past that the color red is more likely to make someone hungry which might be why so many fast food companies use red. However, the studies point towards the opposite. Studies have shown that people are more likely to eat more on a plate that is not red or drink more on a cup that is not red.

So what the red color does is it gets attention. It creates excitement and is easier to remember. So possibly, these factors play a big part in why so many fast food companies choose red for their logos.

https://www.businessinsider.com/why-are-fast-food-signs-red-2015-9