Confining mealtimes and snacks to a nine-hour window and avoiding food for four hours before bed may help stave off cognitive decline in older age, researchers found, according to a report
A pilot study of older women living with overweight or obesity found hints of improvement in mental skills among those who ate within the restricted period compared with those who spread their meals over a longer time
The finding is preliminary given the numbers in the trial, but if confirmed in larger studies, the work suggests people could help to protect their cognitive abilities by eating withing a relatively narrow window and not eating late into the night
Losing weight alone can help slow cognitive decline in older age, said Professor Sue Shapses, a nutritional scientist at Rutgers University in New Jersey, US, but there may be “additional benefits” for people who do not eat outside an eight to nine-hour window, and stop eating four hours before going to sleep
Dementia is the leading cause of death in the UK and the seventh worldwide, leading to nearly 2 million deaths globally each year. Some risk factors are unavoidable, such as age and genetics, but experts believe nearly half of cases could be prevented or delayed through changes to lifestyle. Obesity in middle age can raise the risk of dementia in later life by 30%
Shapses ran a small clinical trial in which 47 women aged 50 to 79, who were living with overweight or obesity, were encouraged to cut 500 calories from their daily diet for six months. Within the group, 26 were advised to eat only within a nine-hour window. Typically, this meant eating between 10am and 6pm, while the rest of the volunteers spread their meals over about 12 hours
At the end of the trial, both groups had similar weight loss averaging about 7kg. But cognitive tests revealed that those who confined their eating to the narrow window performed better than the others on spatial planning and problem solving tests
There were also hints that they made fewer errors on memory and learning tests, though on some multitasking and reaction time tests both groups performed the same
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