Could a lack of sleep be making you fat? UPDATE

Since I wrote about this in May 2010, a new research study has come to light that reinforces my earlier conclusion – that your sleeping habits could be to blame for those extra pounds.

The research study, “Sleep problems and major weight gain: a follow-up study” by P Lyytikäinen, T Lallukka, E Lahelma & O Rahkonen (published online in the International Journal of Obesity on 8 June 2010), shows that middle-aged women who have trouble sleeping are more likely to gain weight than those who sleep well.

The study followed over 7,300 middle-aged (40 to 60 year old) women and men for five to seven years. The researchers found that the women who had reported suffering from “frequent sleep problems” (trouble falling asleep or staying asleep on at least 14 nights in the past month) at the start of the study were more likely to report a “major weight gain” (11 or more pounds) over time than the women who slept without difficulty. Even when other factors, such as physical and mental health and lifestyle, were taken into consideration, the link between sleep problems and major weight gain remained – for the women, anyway.

Strangely, there was no association found between the men with troubled sleep and major weight gain, however. Whilst the reason for this difference is unknown, it’s possible that the fewer male participants (1,300 men compared to more than 5,700 women) could have made the link more difficult to spot.

Lead researcher, Peppi Lyytikäinen, told Reuters Health that while the findings do not prove cause-and-effect, they raise the possibility that improving sleep quality might help stave off excess weight gain.

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