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According to the latest research, workers who regularly pull overnight shifts may be more prone to accumulation of excess weight. Many workers across the globe follow that work pattern, routinely working a night shift increases the risk of becoming obese or overweight.

Sleep disruption is responsible for the accumulation of excess weight, the human body is programmed to sleep when it is dark, allowing hormones that impact hunger and satiety to reset. When people are awake and working when they should be sleeping, the hormones related to hunger and satiety are active resulting in changes in eating, metabolism and a tendency to eat more than needed.

Sleep deprivation is a major stressor that should be avoided, working night shifts is working against natural biological clocks. According to the International Labour Organization, any schedule that requires working between 12 a.m. and 5 a.m. is considered night-shift work.

The review revealed that workers who are permanently assigned to overnight work are prone to accumulation of excess weight, compared with those who alternate between day and night shifts. The longer a worker engages in regular night-shift work, the higher the risk for gaining weight.

Abdominal obesity is linked to night-shift work, night-shift work is related to metabolic syndrome. The syndrome includes high blood pressure, high cholesterol and high triglyceride levels, and it drives up the risk for developing heart disease, diabetes and stroke.

According to the National Sleep Foundation, wakefulness naturally hits its lowest point between 2 a.m. and 4 a.m., at the center of a standard night shift. Night shifts also challenge a worker's ability to access good food and exercise regularly.
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