Just because there’s a statistical correlation doesn’t mean there’s a cause and effect relationship. Nonetheless, researchers in Japan have published a study showing a correlation between your attitude and your ability to lose weight. The result claimed is that excessive optimism is bad for your waistline. Apparently, optimistic people have more trouble sticking to a diet.
Minimally, this trashes the whole fad of visualizing your success and believing you can succeed to make it happen. It seems if you’re trying to lose weight, it’s best to adopt an attitude of doom and imminent failure. Given this postulate, one would expect that Eeyore should be thinner.