"Food deserts"--evidence and assumption in health policy making.

In December 2001 a cross party motion on food poverty signed by 198 UK MPs gained its first reading in parliament. The Food Poverty (Eradication) Bill is now waiting to be read for a second time. Though this bill is a laudable attempt to introduce a policy designed to improve the nutrition of those with the lowest incomes and in the poorest places, it is an example of how some ideas become accepted as fact though they may not be true. They become “factoids”: assumptions or speculations reported and repeated so often that they are popularly considered true; they are simulated or imagined facts. This paper illustrates how, if the social climate is right, facts about the social world can be assumed and hence used as the basis for health policy in the absence of much empirical information.