Another way to help your memory is to walk more. A recent study tracking people over a nine year period showed that those people who walked the most cut their risk of developing memory problems by half.
The study suggest that nine miles a week – or in the urban US terms of the data, 72 Pittsburgh city blocks – is the optimum distance for "neurological exercise".
The paper, published in Neurology, the online medical journal of the American Academy of Neurology, found no discernible bonus in going the extra mile after that. Phew!