Such a tax would not work  A fat tax would only produce a slight change in behaviour. Research by the London School of Economics said that “those on the very poorest diets will continue to eat badly. [16]”  People like fast fatty food because it is quick and tasty. Eating is something we need to do to live – it solves a specific need quickly, and people are happy to pay for it. [17]  Obesity has many causes. It is not something that can be solved with something as simple as a fat tax. Things like healthy food vending machines, more exercise and better education would be more effective in the long run.