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Why you’re more likely to overeat in the evening

Is the fridge your first port of call when you arrive home from work? You deserve a delicious snack after a busy day at the office, right? Snacking does not bode well for our waistlines, though. But according to a new study, you can blame those “hunger hormones.”

Researchers say that the evening hours are a risk factor for overeating. Researchers have found that in the evening, we experience alterations in the levels of hormones that influence appetite, which may cause us to overeat. Unsurprisingly, stress and a predisposition to binge eat were also found to increase hunger levels in the evening. But there may be answer to this problem: eat earlier in the day.

The study — conducted by researchers from the Johns Hopkins School of Medicine in Baltimore, MD, and the Mount Sinai Icahn School of Medicine in New York City, NY — was recently published in the International Journal of Obesity. The research included 32 adults, aged 18–50 years, who were overweight. Around half of the participants had received a diagnosis of binge eating disorder, which is defined as episodes of uncontrollable eating that often lead to weight gain.

Each subject was asked to participate in two experiments. The first required the subjects to fast for 8 hours before receiving a “liquid meal,” consisting of 608 calories, at 9 a.m. For the second experiment, participants were again asked to fast for 8 hours, but this time, they consumed the liquid meal at 4 p.m.

Around 130 minutes after each meal, the participants all underwent a stress test. This required the subjects to place one hand in a bucket of cold water for 2 minutes, while their facial expressions were recorded.

Participants were offered a food and drink buffet, which consisted of pizza, cookies, chips, candy, and water, 30 minutes after the stress test began. The researchers also took blood samples from the subjects, and these were monitored for levels of the “stress hormone” cortisol, as well as the “hunger hormones” ghrelin and peptide YY (PYY). Subjects were also asked to report their levels of hunger and fullness prior to each experiment.

The overall aim of this research was to determine how the time of day affects appetite, and whether stress might play a role.

“Eating late in the day is common, and stress can induce eating,” the researchers report. “Little is understood about how time of day and stress interact to affect appetite and thereby body weight. These may be particularly important influences in binge eaters, who tend to binge in the evening, and in response to stress.”



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March 2018
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