If changing our eating patterns could have even a small effect, it is worth understanding. Sticking
to a restrictive, calorie-controlled diet is challenging, but eating at a different time of the day
might be easier to achieve.
The question is, does eating later in the day really make a difference? A recent experiment by
scientists at the University of Colorado in Denver uses in-depth personal monitoring to gain fresh
Some earlier work has identified a pattern between eating later and increased weight gain. For
instance, the authors of a 2011 study concluded that caloric intake after 8:00 p.m. may increase
the risk of obesity.
However, it is not clear whether individuals who eat later in the day might, consequently, have
less sleep overall. This factor is important because experts also believe that sleeping less may
play a part in obesity.
The lead author of the latest investigation, Dr. Adnin Zaman, explains that few studies have
assessed both meal and sleep timing in adults with obesity, and it is not clear whether eating later
in the day is associated with shorter sleep duration or higher body fat.
The researchers presented their findings at the ENDO 2019 conference, which took place in New
The scientists recruited 31 adults with an average age of 36 years who were overweight or had
obesity. To capture as much relevant information as possible, the scientists assessed the
participants#39; sleep, levels of activity, and diet.
Each participant wore an Actiwatch that monitored their sleep-wake cycles. They also wore an
activPAL electronic device on their thigh, which measured how much time they spent both doing
physical activity and being sedentary.
The participants kept track of what they ate using a phone app called MealLogger. Using the app,
they photographed each meal and snack that they consumed, which provided the time of day that
they ate it. The researchers used a continuous glucose monitor to verify dietary intake.
The analysis showed that, on average, the participants ate their food during an 11-hour window
and had 7 hours of sleep each night.
As expected, those who ate later in the day had a higher BMI and greater levels of body fat.
Importantly, the researchers also showed that those who ate later in the day still had an average
of 7 hours of sleep, implying that a lack of sleep is not the primary driver of these effects.
This preliminary trial is part of an ongoing project to look at these interactions in more detail.
Dr. Zaman notes, These findings support our overall study, which will look at whether
restricting the eating window to earlier on in the day will lower obesity risk.
Experiments such as this one are only possible now due to the prevalence of modern technology
in our lives. Dr. Zaman explains, Given that wearable activity monitors and smartphones are
now ubiquitous in our modern society, it may soon be possible to consider the timing of
behaviors across 24 hours in how we approach the prevention and treatment of obesity.
However, because this is a small-scale project of short duration, it is important to approach the
findings with caution. It will be interesting to see the final results from the full study. The
authors are also keen to run similar experiments with people who have a healthy body weight to
see if there is a similar trend among this group.
As the current findings align with those of earlier investigations, the timing of meals
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