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Simple eating window can rival dietitian advice in pre-diabetes study

A major Australian clinical trial has found that timing when you eat can be just as effective as traditional dietitian-led advice in trying to lower the risk of developing type 2 diabetes.

Key points:

• Study shows time-restricted eating achieved similar improvements in metabolic risk as those receiving clinical advice from dietitians in the first four months.
• Time-restricted eating requires minimal resources, no calorie counting, and little specialist support, making it a simpler option for lifestyle change.
• With diabetes rates rising globally and limited access to healthcare in rural and regional communities, the findings could reshape early prevention strategies.

Researchers from Australian Catholic University and the Adelaide University tested whether time-restricted eating – limiting food intake to a consistent nine-hour daily window – could match the gold standard of personalised dietary counselling in a telehealth-delivered intervention.

Published in Diabetologia, the study of 247 adults at risk of type 2 diabetes found those who confined their eating to a daily nine-hour window achieved similar improvements in metabolic risk as those receiving clinical advice from dietitians in the first four months.

Lead author Dr Evelyn Parr, an exercise and nutrition expert at ACU’s Mary MacKillop Institute for Health Research, said the long-term study showed time restricted eating was a practical and effective first step – as both groups lost weight and improved blood pressure.

After four months, the key measure of long-term blood sugar, known as HbA1c, was the same in both groups.

Time-restricted eating requires minimal resources, no calorie counting, and little specialist support, making it a simpler option for lifestyle change.

Dr Parr said it is a promising alternative where dietitians aren’t easily accessible and could be a convenient first step, especially in primary care or telehealth settings, to help people at risk.

“Time-restricted eating matched dietitian-led care for glucose health in people at risk of diabetes after four months and is easier to stick with,” she said.

“Our research suggests this much simpler approach could be a viable option for people at risk, particularly where access to dietitians is limited.

“It had similar results to individualised advice from an accredited practising dietitian but there were added benefits, because it was simple, achievable, easy to stick to - and motivated people to make other positive changes.

Dr Parr said time-restricted eating does not dictate what foods to eat, only when to eat them. By giving the body a long break from food each night, it also reinforced beneficial circadian rhythms.

“On the flip side, our participants who did receive dietetic support had beneficial improvements to blood lipids, which were not evident for our time-restricted eating group, reinforcing that dietary changes are important to improve metabolic health,” Dr Parr said.

“We already know from decades of research that dietetic support is important and is the gold standard approach from a nutritional perspective for a reason, but it is often only offered as a single consultation which is not effective.”

With diabetes rates rising globally and limited access to healthcare in rural and regional communities, she said the findings could reshape early prevention strategies.

“We want to raise awareness that there are ‘more options on the menu’ for making dietary modifications to improve blood glucose management for those at risk of developing type 2 diabetes,” she said.

“Eating is not just about food, it is also about culture, celebration and family and it can be difficult to make changes, but we have shown that making these small changes can be meaningful.”

Previous research has shown time-restricted eating can reduce insulin resistance, inflammation and risk factors for cardiovascular disease, improve brain function and repair DNA.

Co-author Professor Leonie Heilbronn from Adelaide University said while the study showed time-restricted eating can help people adopt healthier habits and achieve modest weight loss, combining timing with improved food choices is key for broader metabolic health.

“Although the improvements in weight and health were modest in both groups, the research team deliberately designed a light-touch intervention with only five dietary support visits available over 12 months,” Professor Heilbronn said.

“The design reflects current Australian chronic disease management plans and highlights an important gap between routine care and what many people living with prediabetes need to achieve lifestyle changes.”

Media Contact: Elisabeth Tarica, Australian Catholic University on 0418 756 941 or elisabeth.tarica@acu.edu.au