If you're wondering how to lose weight, you're better off being kept in the dark.
According to a study, those living in well-lit towns or cities are more likely to become obese than country dwellers —even if they eat the same amount.
Scientists believe that the glow of street lights encourages late-night snacking, and because food eaten close to bedtime is less likely to be burned off, it is often stored as fat.
But before you swap calorie counting for a blackout blind, it seems that all unnatural light could have the same effect – including that from computer screens and TVs.
American researchers found that mice that were exposed to a dim light at night put on 50 per cent more weight than those whose cages were left dark.