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Avoid eating this food before bed if you want a good night sleep

LIFESTYLE

Your sleep might not be restful if there are visions of sugar plums dancing in your head — or your gut.

A new study finds that eating a junk food diet filled with sugar, saturated fat and processed foods results in poor sleep quality.

And when the participants in that study were switched to a healthier diet, their sleep quality improved.

Jonathan Cedernaes Associate professor at Uppsala University

“Both poor diet and poor sleep increase the risk of several public health conditions.”

Sleep problems have been linked to an increased risk of hypertension, diabetes, obesity, depression, heart attack and stroke, according to the National Institutes of Health.

Jonathan Cedernaes Associate professor at Uppsala University

“[N]o study had previously investigated what happens if we consume an unhealthy diet and then compared it to quality of sleep after that same person follows a healthy diet.”

The researchers asked 15 healthy young male volunteers to follow a healthy diet, and an unhealthy diet, in a random order for one week. Each diet contained roughly the same amount of calories.

Pizza, sugary cereal, meatballs and chocolate wafers were the mainstays of the unhealthy diet. The healthier diet contained unsweetened yogurt, muesli, salmon and vegetables.

The unhealthy diet contained nearly double the amount of fat — 44% versus 23% — of the healthy diet, and almost double the amount of sugar, too (17% versus 9%).

The participants’ sleep was measured in a sleep laboratory with polysomnography, which uses a device that measures brain waves, oxygen levels in the blood, heart rate, breathing and eye movements, according to the Mayo Clinic.

But after eating an unhealthy diet, during a deep sleep stage of rest, the amount of slow-wave activity in the men’s brains was reduced. Slow-wave brain activity is one measure of how restorative sleep is, and insulin sensitivity and the secretion of growth hormones have been linked to slow-wave sleep.

Jonathan Cedernaes Associate professor at Uppsala University

“Intriguingly, we saw that deep sleep exhibited less slow-wave activity when the participants had eaten junk food, compared with consumption of healthier food. Essentially, the unhealthy diet resulted in shallower deep sleep.”

The results, reported in the journal Obesity, showed that the men slept about the same amount of time, and spent the same amount of time in different stages of sleep, regardless of their diet.

The study authors noted that their investigation was limited by the participants selected, all of whom were physically active young men with no obesity or weight issues, and by the fact that there were only 15 participants.

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