Obesity is inversely correlated with being republican. Not strongly, but it is there.

"Healthy At Any Size" movements tend to originate from the Democraft side of the aisle, and taking responsibility for your own life situation is generally considered a Republican talking point, which would include going to the gym/dieting/working out.

It's not a strong correlation, but democrats encourage the practice of becoming obese, while republicans discourage the state of being obese, at least on a passive level, leading to that inverse correlation. You can be a fat republican, and you can be a fit democrat, but you're statistically not the expected result.