Yep-- Colorado has, on average, lower degrees of poverty and higher levels of education than the national averages. Factors that research indicates are well correlated with obesity. These are more likely factors in their low obesity rates than the direct metabolic impact of local climate.
It local climate has an impact, its somewhat temperate nature probably plays a large part: It has a fair amount of sunshine but doesn't reach the peak temperatures of other high-sunshine states, which probably contributes to the local culture of outdoor activity, and outdoor activities are going to burn more calories.
"It has a fair amount of sunshine but doesn't reach the peak temperatures of other high-sunshine states, which probably contributes to the local culture of outdoor activity, and outdoor activities are going to burn more calories."
It's a simple, true enough fact to make active people move to and live in Colorado, which they do, and which in some part has to impact the overall averages.
It local climate has an impact, its somewhat temperate nature probably plays a large part: It has a fair amount of sunshine but doesn't reach the peak temperatures of other high-sunshine states, which probably contributes to the local culture of outdoor activity, and outdoor activities are going to burn more calories.