Researchers at the University of Illinois-Chicago, US, found that people who ate only during an eight-hour window between noon and 8 p.m. each day actually lost more weight over six months than participants who were instructed to reduce their calorie intake by 25 per cent.
Both groups had similar reductions in long-term blood sugar levels, as measured by a test of haemoglobin A1C, which shows blood sugar levels over the past three months.
The study, published in JAMA Network Open, enrolled 75 participants into three groups: those who followed the time-restricted eating rules, those who reduced calories and a control group. Participants’ weight, waist circumference, blood sugar levels and other health indicators were measured over the course of six months.
Krista Varady, professor of kinesiology and nutrition at the varsity, said that participants in the time-restricted eating group had an easier time following the regime than those in the calorie-reducing group.
The researchers believe this is partly because patients with diabetes are generally told to cut back on calories by their doctors as a first line of defence, so many of these participants likely had already tried — and struggled with — that form of dieting.
And while the participants in the time-restricted eating group were not instructed to reduce their calorie intake, they ended up doing so by eating within a fixed window.
“Our study shows that time-restricted eating might be an effective alternative to traditional dieting for people who can’t do the traditional diet or are burned out on it,” said Varady. “For many people trying to lose weight, counting time is easier than counting calories.”
There were no serious adverse events reported during the six-month study. Occurrences of hypoglycemia (low blood sugar) and hyperglycemia (high blood sugar) did not differ between the diet groups and control groups.
The study was small and should be followed up by larger ones, said Varady. While it acts as a proof of concept to show that time-restricted eating is safe for those with type 2 diabetes, Varady said people with diabetes should consult their doctors before starting this sort of diet.
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