A fat tax is a tax or surcharge that is placed upon fattening food, beverages or on overweight individuals. An example of a fat tax is Pigovian taxation, a fat tax that aims to discourage unhealthy diets and offset the economic costs of obesity.

In October 2011, Denmark introduced a fat tax on butter, milk, cheese, pizza, meat, oil and processed food if the item contains more than 2.3% saturated fat. However, in November 2012, the Danish Tax Ministry announced it would abolish the fat tax, stating that it failed to change Danes' eating habits, had encouraged cross border trading, put Danish jobs at risk and had been a bureaucratic nightmare for producers and outlets. The failure of Denmark's fat tax was also due to financial reasons, with politicians identifying the fat tax as a funding source for the government, rather than a health initiative that attempted to improve the health outcomes of society. The proposed sugar tax plans were also scrapped.

Mette Gjerskov, the Danish minister of food, agriculture and fisheries, stated that "the fat tax is one of the most criticized we had in a long time. Now we have to try to improve public health by other means.” Although the tax resulted in an additional $216 million in revenue, it also led to numerous complaints from Danish retailers that their customers were taking their business to other countries, such as Sweden and Germany, to take advantage of their lower prices.

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