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Overnight eating may be increasing the risk of chronic health conditions for night shift workers, suggests a new study by the University of South Australia, University of Adelaide and SAHMRI.

Researchers undertook a six-day trial, involving 55 adults in the healthy BMI range, who don鈥檛 usually work night shifts, for the NHMRC-funded study, published in Diabetologia.

Participants stayed at the University of South Australia鈥檚 Behaviour-Brain-Body Sleep Research Centre and were divided into three groups: those who fasted at night, those who had snacks, and those who ate full meals.

All participants stayed awake for four nights and slept during the day, with a recovery day on day five to re-establish normal sleeping and eating cycles, and blood glucose testing on day six.

Meal timing and glucose tolerance

Results showed participants who ate meals or snacks during the night shift had significantly worse glucose tolerance compared to those who fasted, said Professor Leonie Heilbronn, from SAHMRI and the University of Adelaide.

鈥淲e found that blood glucose skyrocketed for those who ate full meals at night and those who snacked, while the people who fasted at night showed an increase in insulin secretion which kept blood sugar levels balanced.鈥�

鈥淲e know shift workers are more likely to have diabetes, they鈥檙e more likely to have heart disease, and they鈥檙e more likely to be overweight. Our research suggests that meal timing could be a major contributor to those issues,鈥� Heilbronn said.

Circadian misalignment

Insulin sensitivity was disrupted among all participants, regardless of their eating habits, adding to the body of evidence that night shifts cause circadian misalignment and impair glucose metabolism.

鈥淲hen you eat a meal, your body secretes insulin, and that insulin helps your muscles and other tissues to take up glucose. If you become resistant to insulin, then you can鈥檛 take up that glucose as effectively into your muscles and if it continues, that potentially puts you at risk of diabetes.鈥�

Lead investigator UniSA Professor Siobhan Banks said not eating large meals while working night shift and instead eating primarily during the day could be a straightforward intervention to manage health outcomes for many workers.

鈥淭his could be easier for people to follow than other, more complex diets,鈥� Banks said.

Researchers said future trials will investigate whether eating only protein snacks on night shift is a potential solution to satiating hunger without predisposing workers to negative health consequences.

Image credit: iStock.com/Jacob Wackerhausen