Can a late dinner lead to weight gain?

Eating a late dinner may contribute to weight gain and high blood sugar, according to a new study.

More than 2.1 billion adults are estimated to be overweight or suffer from obesity that makes health complications such as diabetes and high blood pressure more likely.

Previous studies have suggested that there is a link between consuming calories later in the day and obesity and metabolic syndrome.

According to co-author Dr Jonathan Jun, of Hopkins University, this new study sheds light on how eating a late dinner worsens glucose tolerance and reduces the amount of fat burned.

“The effect of late eating varies greatly between people and depends on their usual bedtime,” Dr Jun explained. “This shows that some people might be more vulnerable to late eating than others.

“If the metabolic effects we observed with a single meal keep occurring chronically, then late eating could lead to consequences such as diabetes or obesity.”

The researchers studied 20 healthy volunteers (10 men and 10 women) to see how they metabolised dinner eaten at 10pm compared to 6pm.

The volunteers all went to bed at 11pm.

The researchers found that blood sugar levels were higher, and the amount of ingested fat burned was lower with the later dinner, even when the same meal was provided at the two different times.

“On average, the peak glucose level after late dinner was about 18 per cent higher, and the amount of fat burned overnight decreased by about 10 per cent compared to eating an earlier dinner,” explained study author Dr Chenjuan Gu.

“The effects we have seen in healthy volunteers might be more pronounced in people with obesity or diabetes, who already have a compromised metabolism.”

This is not the first study to show effects of late eating, but it is one of the most detailed.

Participants wore activity trackers, had blood sampling every hour while staying in a lab, underwent sleep studies and body fat scans, and ate food that contained non-radioactive labels so that the rate of fat burning (oxidation) could be determined.

“We still need to do more experiments to see if these effects continue over time, and if they are caused more by behaviour (such as sleeping soon after a meal) or by the body’s circadian rhythms,” Dr Jun said.

What time do you usually eat dinner?

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Written by Ben

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