That's one of the rabbit holes I went down for Edition #58 of Curiosity Saved The Cat, which went out this Sunday
Red makes you hungry, blue kills your appetite, and orange feels like a snack. None of that is accidental: it's color psychology applied deliberately, and food brands have been doing it for decades. But the more interesting part is that this conversation between your brain and color is happening everywhere, all the time, whether you're looking at a logo or just reaching for a mug in the morning.