The last thing you might expect to have an effect on your weight is noise. Yet this is what one Swedish study has discovered and this could force many people who work in offices near busy roads to consider installing better sound insulation.

Weight gain has traditionally been associated with inactivity and eating too much, but the Swedish study on the effects of noise found that noise from traffic had the potential to increase fat deposits around the waste due to the effects of cortisol production.

Cortisol is a steroid hormone produced by the body in reaction to stress. Having too much cortisol in the body often leads to weight gain and the Swedish study of more than 5,000 people found that noise triggered an increase which led to weight gain in the majority of participants.

Road traffic noise contributed to a 0.21 cm increase in waist size for women compared to 0.16 cm for men which means the former is more likely to suffer the waist expanding effects of noise. The study also found a direct relationship between an increase in the sources of noise and the amount of fat carried around the waste.