The Danish politicians who taxed fat were the victims of erroneous medical advice.

Sugar causes obesity, and we explain further in our research review paper:

Is the metabolic syndrome caused by a high fructose, and relatively low fat, low cholesterol diet?

Seneff S, Wainwright G, Mascitelli L.

Arch Med Sci. 2011 Feb;7(1):8-20 Epub 2011 Mar 8.

doi: 10.5114/aoms.2011.20598