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Time-limited dining limited to kl. 8 and 16 did not lead to a greater reduction in body weight, body fat, or metabolic risk factors compared to a daily calorie restriction, according to a study published in the New England Journal of Medicine this week.
Researchers at Southern Medical University in Guangzhou, China randomly assigned 139 obese patients into two groups: A group that participated in a time-limited eating regimen, eating only between 6 p.m. of participants who engaged only in daily calorie restriction without a time-limiting cure.
The male participants were instructed to limit their daily calorie intake to only 1500 -1800 calories, while females followed a calorie restriction of 1200 to 1500 calories each day.
The primary outcome of the study was the difference in body weight between the two groups from baseline and secondary outcomes were changes in waist circumference, body mass index, amount of body fat, and measures of metabolic risk factors.
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Participants were encouraged to weigh food to ensure accurate calorie reporting, were required to keep a food diary and photograph the food they ate during the first six months of the study, and recorded food photos and meals three times a week during the study. . last six months.
118 out of 139 participants completed the study with researchers noting, “Weight changes were not significantly different in the two groups at the 12-month assessment.”
“In addition, time-limited eating and daily calorie restriction produced similar effects in terms of reductions in body fat, visceral fat, blood pressure, glucose levels, and lipid levels during the 12-month intervention period,” the researchers said.
The authors added, although limiting calorie intake explained most of the beneficial effects associated with time-limited eating, their results suggested that time-limited eating could be an alternative to limiting calories to weight control.
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“We speculate that these data support the importance of calorie-restricted intake when adhering to a time-limited eating regimen,” the study noted.
The authors warned that their study could not be generalized to diabetic patients, to those with heart disease, to different periods of time-limited eating, while also noting that their study was limited because physical activity was not controlled as total energy expenditure was not measured .
“Almost all types of diets out there work for some people,” said Dr. Christopher Gardner, director of nutrition studies at the Stanford Prevention Research Center.
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“But the homecoming supported by this new research is that when subjected to a properly designed and performed study – scientific study – it is no more useful than simply reducing the daily caloric intake for weight loss and health factors.”