Conventional wisdom holds that obesity is caused by over-indulgence in fatty or sugary foods, portrayed as either a failure of will power or a species of addiction. Various specialists strongly oppose this view. For example, Professor Thomas Sanders, the director of the Nutrition, Food & Health Research Centre at King's College London, emphasises the need for balance between activity and consumption:
In trials, there is no evidence suggesting that reducing fat intake has an effect on obesity. As long as your expenditure equals what you eat, you won't put on weight, regardless of how high the fat content is in your diet (The Times, London, 10 March 2004).