"There are some important nuances here. As the Sugar Association points out,
sugar does not technically cause obesity; rather, eating more calories
than you burn does. This is at best a half truth. The truer statement,
as Action on Sugar makes plain, is that there is absolutely no need for added sugar in the human diet—added sugar is purely empty calories."
Big Sugar Is the New Big Tobacco
This link addresses sugar and refined carbohydrates, but also looks at a type of fat.
What's wrong with the Western diet.