The Dutch presumably also eat a Dutch diet so it's going to be tricky to disentangle. For what it's worth, the French rank right behind the Netherlands in obesi

The Dutch presumably also eat a Dutch diet so it's going to be tricky to disentangle. For what it's worth, the French rank right behind the Netherlands in obesity rate but I wouldn't say most people are very physically active. My own experience and studies I have seen show that exercise leads to some early weight loss but then plateaus quickly. To lose further, diet has to be involved.