Sleep and weight
Obesity in another disorder linked with insomnia. Research shows that diets that are higher in saturated fats are more susceptible to chronic diseases and disorders which includes insomnia (Novak et al. 1995). This is an alarming fact as 20% of the population of the United States of American are overweight or obese (Patterson et al. 2004).
Many studies, including one spanning twenty years, have tested the hypothesis that sleep and obesity are linked and the majority of results show positive correlations (Gangwisch et al. 2005). Further studies, with over 500,000 total participants via meta‑analysis have supported obesity and insomnia in adults and children (Cappuccio et al. 2008). The trends of increasing BMI and reduced sleep hours appear to go hand in hand, along with sleeping troubles related to Sleep Apnoea often seen in obese patients.
This link between Obesity and the symptoms of its associated diseases demonstrates a common trend towards diminishing an individual’s peak performance. Obesity and many of the health conditions which result from it increase the lower productivity levels associated with lower mental and cognitive functioning.
Obesity is also a serious factor in poor sleep habits. In a number of studies obesity was associated with "reduced sleeping hours " (Ko et al (2007). Obesity, particularly abdominal and upper body obesity, is the most significant risk factor for Obstructive Sleep Apnea (OSA). Patients with sleep apnea often experience daytime sleepiness and difficulty concentrating (Teran-Santos et al, 1999). Studies have also shown a strong association between sleep apnea and the risk of traffic accidents (Terán-Santos et al (1999). In fact, subjects suffering from sleep apnea were at a higher risk than those who had consumed alcohol to be involved in a traffic accident. This has major implications, particularly for overweight and obese workers using any form of equipment of driving vehicles.
This lack in sleep will then leave the employee going to the work already feeling tired, irritable and stressed, therefore making it difficult to concentrate, and highly increasing the chances of being injured or making a mistake which may put fellow workmates in danger (Lynch, 2005) It is situations like this, where the worker comes to work already feeling tired, that the employee is putting his safety and other's safety at risk.
Shift workers are known to be a high-risk group for obesity. In the current study population, rotating-shift workers showed a higher distribution of the highest body mass index compared with daytime workers
In a study of the brains of 24 participants after both a good and a bad night’s sleep. after disturbed sleep, there was increased activity in the depths of the brain, areas which are generally associated with rewards and automatic behaviour. It seems a lack of sleep robs people of their self-control and so their good intentions are quickly forgotten.
What we have discovered is that high-level brain regions required for complex judgments and decisions become blunted by a lack of sleep, while more primal brain structures that control motivation and desire are amplified.”
In other words: lack of sleep robs people of their self-control and so their good intentions are quickly forgotten.
On top of this, the researchers found that after being deprived of sleep, participants displayed greater craving for high-calorie junk food. The more sleep-deprived they were, the greater the cravings. A stufy of 13,284 teenagers found that those who slept poorly also made poor decisions about food. Similarly, a Swedish study found that at a buffet, tired people were more likely to load up their plates.
The link has even been made from poor sleep through to food shopping. A Swedish study found that men who were sleep-deprived bought, on average, 9% more calories than those who’d had a good night’s sleep. These results were likely the result of the poor decision-making. It had been thought that the tendency to eat more after poor sleep was related to the so-called ‘hunger hormone’ ghrelin. But the latest studies suggest that it’s simple self-control that is most important in causing the sleep-deprived to over-indulge.