Sleeping Late at Night does make you Fat, says Researchers – Staying up late and sleeping in at late hours increases the risks of fat gain, says the researchers in a recent study conducted by Northwestern University.

According to the researchers, individuals who do sleep at late hours are associated with high fast food consumption, and these extra calories transform into a significant amount of weight gain. Late Night sleepers tend to opt for more junk food and consume less fruits and veggies, and will indulge in lower physical activity.

The findings included that late night sleep is linked to lower body mass index, and is not related to the total calorie intake but the poor diet quality intake.

Kelly Glazer Baron, Principal investigator of the study said, “Our results help us further to comprehend how sleep timings in addition to duration may affect obesity risk. It is possible that poor dietary behaviours may predispose individuals with late sleep to increased risk of weight gain.”

The research team has conducted the study on 96 healthy adults between the ages of 18 and 50 years, who slept on an average for 6.5 hours or more. The team has collected 7 days of wrist actigraphy, measuring sleep, food diaries to measure caloric intake and dietary patterns and SenseWear arm band monitoring for examining the physical activity. They have evaluated the Dim light melatonin onset in clinical research unit and Body fat using dual axis absorptiometry (DXA).

The findings were evaluated using correlation and regression techniques considering the factors age, sex, sleep duration and sleep efficiency. They concluded that in addition to the daily calories intake, the sleep timings and duration were significant in association with higher BMI and Weight Gain. The findings were published in the journal Sleep.

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