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8-Hour Eating Window Improves Glucose Control in Type 2 Diabetes, Regardless of Timing: Randomised Crossover Trial Finds
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Overview
Restricting the eating window to 8 hours a day significantly improves blood glucose control in adults at risk of type 2 diabetes irrespective of whether it is earlier or later in the day, according to a randomised crossover trial presented at this year’s Annual Meeting of The European Association for the Study of Diabetes (EASD), Madrid.
The lead author Dr Kelly Bowden Davies from Manchester Metropolitan University, UK, said, “Our study found that restricting eating to a window of 8 hours per day significantly improved the daily time spent in the normal blood glucose range and reduced fluctuations in blood glucose levels. However, altering the 8-hour restricted eating period to earlier or later in the day did not appear to offer additional benefits,” The lead author Dr Kelly Bowden Davies from Manchester Metropolitan University, UK.
She added: “Our findings, which can be attributed to the 16-hour fasting window rather than the time of eating or changes in energy intake, also highlight that the benefit of time-restricted eating can be seen within just three days. Although time-restricted eating is becoming increasingly popular, no other studies have examined tightly controlled diet and altered the clock time of an eight-hour eating window on glycaemic control in people at risk of type 2 diabetes.”
Previous studies indicate that TRE (which limits when, but not what, individuals eat) can improve insulin sensitivity (the body’s ability to respond to insulin) and glycated haemoglobin (HbA1c; average blood sugar levels over a period of weeks and months) in people at risk of type 2 diabetes.
However, the effect on glycaemic variability (fluctuations in blood glucose levels) is not clear and previous studies have attributed the positive effects of TRE to reduced energy intake. This study sought to understand alterations in meal timing when participants were in energy balance (energy intake was matched with energy expenditure).
To find out more, researchers investigated the impact of TRE in a eucaloric manner—with diets provided to match energy requirements (taking into account sex, age, weight, height, activity level—comparing an early (ETRE; between 8:00 and 16:00 hours) versus a late (LTRE; between 12:00 and 20:00 hours) eating window on glycaemic control in overweight sedentary adults.
The analyses found that in comparison to habitual eating (more than 14 h/day), TRE (8 h/day) significantly increased time spent within the normal blood glucose range by on average 3.3%, and also reduced markers of glycaemic variability—MAG by 0.6 mmol/l, CV by 2.6%, and MAGE by 0.4 mmol/l.
However, no significant differences in glycaemic control were found between the ETRE and LTRE regimens.
Reference: Annual Meeting of The European Association for the Study of Diabetes (EASD), Madrid, Diabetologia.
Speakers
Dr. Garima Soni
BDS, MDS(orthodontics)
Dr. Garima Soni holds a BDS (Bachelor of Dental Surgery) from Government Dental College, Raipur, Chhattisgarh, and an MDS (Master of Dental Surgery) specializing in Orthodontics and Dentofacial Orthopedics from Maitri College of Dentistry and Research Centre. With 2 years of dedicated clinical experience, she brings a blend of academic excellence and practical expertise to the field of dentistry, ensuring high-quality care and innovative solutions for patients.