For a start, in some parts of the country, Americans have eliminated not merely the need to walk, but even the possibility of it. "I'd love to be able to walk to the store, pick up some milk and come home again, but our towns don't really allow that," laments Mary Gilmore, a dietician in Meridian. The distances are too great, the pavements non-existent. In the sprawling suburbs and small towns, public transport is often as rare as in an English village. In any case, it is almost impossible to carry the milk: it usually comes in gallon containers (a US gallon is four-fifths of a UK gallon). In a country where the cost of packaging exceeds the cost of the food, buying any other way is far more expensive.