Researchers at Ohio State University College of Public Health have revealed through a study that preschoolers who go to bed early are at a lower risk of becoming obese in their teens.
The study suggests that preschoolers who went to bed after 9 pm were at twice the risk of becoming obese later in their lives compared to those who went to bed by 8 pm. The findings not only reinforces the importance of going to bed early, it also provides pediatricians with scientific evidence to advise parents. Not only will this habit reduce the risk of obesity, it will also likely have a positive impact on behavioral, social, emotional and coginitive development of the kids.
Excess weight in children is a major health concern in the United States. Approximately 17 percent – 12.7 million – of children and adolescents are obese, according to the latest figures from the Centers for Disease Control and Prevention.
Obesity can set kids up for a lifelong struggle with weight and health complications that can accompany it, including diabetes and heart disease.
The new research, which appears in the The Journal of Pediatrics, used data from 977 children who were part of the Study of Early Child Care and Youth Development. That project followed healthy babies born at 10 U.S. sites in 1991.
Authors of the study divided preschool bedtimes into three categories: 8 p.m. or earlier, between 8 p.m. and 9 p.m., and after 9 p.m. The children were about 4 ½ years old when their mothers reported their typical weekday bedtime. The researchers linked preschoolers’ bedtimes to obesity when the kids were teens, at an average age of 15.
They found a striking difference: Only 1 in 10 of the children with the earliest bedtimes were obese teens, compared to 16 percent of children with mid-range bedtimes and 23 percent of those who went to bed latest. Half the kids in the study fell into the middle category. A quarter had early bedtimes and another quarter went to bed late.
Because the emotional climate at home can influence routines such as bedtime, authors also examined interactions between mothers and their children during a videotaped playtime. Scientists call the measurement “maternal sensitivity” and it factors in maternal support, respect for the child’s autonomy and lack of hostility.
Regardless of the quality of the maternal-child relationship, there was a strong link between bedtimes and obesity, the researchers found. But the children who went to bed latest and whose moms had the lowest sensitivity scores faced the highest obesity risk.
The researchers also found that later bedtimes were more common in children who were not white, whose moms had less education and who lived in lower-income households.
Previous research has established a relationship between short sleep duration and obesity. And one study found a correlation between late bedtimes and obesity risk five years later. This new bedtime study is the first to use data on obesity collected about a decade after the children were in preschool, said the researchers.
The team’s previous research has illustrated the importance of household routines for preschool-aged children and this builds on that work.
Authors said they focused on bedtimes because they have a greater impact on the duration of sleep than do wake times, over which parents have less control. When parents and older siblings must get up and out the door early, that often means young children rise early as well.
The majority of young children are biologically preprogrammed to be ready to fall asleep well before 9 p.m., according to previous research. The study doesn’t answer questions about how sleep time intertwines with a variety of other factors that can contribute to weight gain in childhood, including physical activity and nutrition and that remains an active area of research.