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Sleep deprivation 'brings greater risk of obesity'13 July 2006 Children and adults who don't get enough sleep are putting themselves at increased risk of developing obesity, claim medical researchers from Warwick University. After a study of 28,000 children and 15,000 adults, it was found that people with "shorter sleep duration" had almost twice the risk of becoming obese, with an increase in their body mass index and waist size over time. The study suggests that the key to a link between sleep and weight is the increased appetite found among people who stay awake for longer than they should. Lack of sleep produces the hormone ghrelin which stimulates hunger, while also producing less of the hormone leptin, which keeps appetite under control. Professor Francesco Cappuccio from the university suggested that "the 'epidemic' of obesity is paralleled by a 'silent epidemic' of reduced sleep duration with short sleep duration linked to increased risk of obesity both in adults and in children". He added: "These trends are detectable in adults as well as in children as young as five years." Experts from the World Health Organisation commented that more research is needed into the social environment surrounding people with obesity before firm conclusions can be drawn. According to the Royal College of Psychiatrists, older children should ideally get between nine and 10 hours sleep every night, with seven to eight hours the optimum time for adults. More information
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