Synonymous to comfort food, comfort cartoon provides feelings of nostalgia and sentimentality towards the viewers. The type of animation tends to be stylized and visually appealing: over or under saturation of colours, "incorrect" motion etc.
The storylines tend to be rich with lessons and underlying meanings (nutrients) or sometimes it's just for pure fun and joy (carbs).
Popular examples would be: Classic Looney Tunes, B&W Mickey Mouse, retro Disney (70's or 80's classics).
I had a shitty day at work today, but I wanted to stick to my diet...so instead of gorging on burgers and ice cream, I watched comfort cartoons instead.