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Want to lose body fat? Eat a later breakfast and an earlier dinner, new study suggests

Oh boy, I need to get an earlier dinner.

Mihai Andrei by Mihai Andrei
November 24, 2020
in News, Nutrition
Reading Time: 3 mins read
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Even modest changes to the timing of your first and last meal of the day can reduce body fat, a new pilot study suggests — but it may only work with intermittent fasting.

Image credits: Alexandra Gerea / ZME Science.

If you try to google information about when you should eat breakfast and dinner, you’ll probably find a million different ideas, many of them contradicting each other. The truth is, while science has figured out some things about breakfast and dinner, there’s just a lot of independent aspects and subjective variability that it’s hard to pin down specifics. But a new study could take us one step closer to figuring things out.

During a 10-week study on ‘time-restricted feeding’ (a form of intermittent fasting), researchers led by Dr. Jonathan Johnston from the University of Surrey wanted to see how changing meal times affects dietary intake, body composition and blood risk markers for diabetes and heart disease. So they split participants into two groups: those who were eating as before (the control group) and those who were required to delay their breakfast by 10 minutes, and have their dinner 90 minutes earlier.

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Unlike other studies, participants could eat anything they would normally eat — no restrictions were applied other than the time of the meal.

While all participants lost some body fat, participants who had their meal times changed lost two times more body fat than the control group. People also noticed that they were eating less, either due to a reduced appetite or a cutback in snacking (particularly in the evenings). However, the study comes with a few significant limitations.

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For starters, only 13 participants completed the study — hardly a conclusive number. Also, this study only established a correlation, it’s still not clear if the reduction in body fat is caused by shifting the meal times or if it’s something else completely — and to make matters even more complicated, it’s hard to disentangle the effect of intermittent fasting from the time shift.

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But things are certainly promising.

This study is an intriguing proof of concept and could help design bigger, more conclusive studies in the near future. Lead author Dr. Johnston comments:

“Although this study is small, it has provided us with invaluable insight into how slight alterations to our meal times can have benefits to our bodies. Reduction in body fat lessens our chances of developing obesity and related diseases, so is vital in improving our overall health.However, as we have seen with these participants, fasting diets are difficult to follow and may not always be compatible with family and social life. We therefore need to make sure they are flexible and conducive to real life, as the potential benefits of such diets are clear to see.“

“We are now going to use these preliminary findings to design larger, more comprehensive studies of time-restricted feeding.”

The study was published in the Journal of Nutritional Science.

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Mihai Andrei

Mihai Andrei

Andrei's background is in geophysics, and he's been fascinated by it ever since he was a child. Feeling that there is a gap between scientists and the general audience, he started ZME Science -- and the results are what you see today.

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