Eating a very early dinner, or even skipping it, may help you lose weight, a new study has found.
The first human test of early time-restricted (eTRF) feeding found that meal-timing strategy reduced swings in hunger and altered fat and carbohydrate burning patterns, which may help with losing weight.
In eTRF, people eat their last meal by the mid-afternoon and do not eat again until breakfast the next morning.
"Eating only during a much smaller window of time than people are typically used to may help with weight loss," said Courtney Peterson, researcher at Pennington Biomedical Research Centre in the US.
"We found that eating between 8 am and 2 pm followed by an 18-hour daily fast kept appetite levels more even throughout the day, in comparison to eating between 8 am and 8 pm, which is what the median American does," said Peterson.
This new research suggests that eating a very early dinner, or even skipping dinner, may have some benefits for losing weight.
The body has an internal clock, and many aspects of metabolism are at their optimal functioning in the morning.
Therefore, eating in alignment with the body's circadian clock by eating earlier in the day can positively influence health, and this new study of eTRF shows that this also applies to metabolism.
This first test of eTRF in humans follows rodent studies of this approach to weight loss, which previously found that eTRF reduced fat mass and decreased the risk of chronic diseases in rodents.
To conduct their study, researchers followed eleven men and women with excess weight over four days of eating between 8am and 2pm (eTRF), and four days of eating between 8am and 8pm (average feeding for Americans).
The researchers then tested the impact of eTRF on calories burned, fat burned and appetite.
To eliminate subjectivity, the researchers had all participants try both eating schedules, eat the same number of calories both times, and complete rigorous testing under supervision.
They found that although eTRF did not affect how many calories participants burned, it reduced daily hunger swings and increased fat burning during several hours at night.
It also improved metabolic flexibility, which is the body's ability to switch between burning carbs and fats.
Whether eTRF helps with weight loss or improves other aspects of health is still unknown.