Loud snoring at night, frequent pauses in breathing, and feeling tired despite adequate sleep during the day may not be just sleep-related problems. These could be signs of obstructive sleep apnea (OSA). In this condition, the upper airway repeatedly narrows or closes due to the relaxation of the throat muscles during sleep. This obstructs breathing and can lead to decreased oxygen levels in the body.
The effects of sleep apnea are not limited to sleep and daytime energy. Several studies have also linked it to obesity, insulin resistance, and metabolic dysfunction-associated steatotic liver disease (MASLD), formerly known as non-alcoholic fatty liver disease (NAFLD).
The effects of sleep apnea are not limited to sleep and daytime energy. Several studies have linked it to obesity, insulin resistance, and metabolic dysfunction-associated steatotic liver disease (MASLD), formerly known as non-alcoholic fatty liver disease (NAFLD).
When oxygen levels repeatedly drop during sleep, the body must activate additional physiological responses to maintain normal conditions. This lack of oxygen and its subsequent re-availability can increase the formation of reactive atoms called reactive oxygen species. Their excess causes oxidative stress, which can affect normal cell function.
According to the NCBI, a study analyzed the possible links between sleep apnea, intermittent hypoxia, and fatty liver. Mechanisms such as oxidative stress, altered mitochondrial function, and insulin resistance were discussed. However, much of these mechanisms have been understood through experimental and animal studies. Therefore, the risk of developing liver disease in humans cannot be assumed to be the same for everyone.
Why are sleep apnea, obesity, and fatty liver often seen together?
To understand the relationship between obesity, sleep apnea, and fatty liver, it’s important to understand the role of insulin resistance and abdominal fat accumulation. Excess weight, especially abdominal fat, is a significant risk factor for sleep apnea. Excess tissue around the neck and upper airway can narrow the airway during sleep. Furthermore, excess abdominal fat and insulin resistance may affect fat metabolism in the body and increase the risk of excess fat accumulation in the liver.
According to the NCBI, a link was found between sleep-disordered breathing and fatty liver. However, the results of the studies included in the study varied significantly, and the certainty of the evidence was limited. Therefore, this association should be viewed as a sign of risk, not a guarantee of a person’s disease.
Both sleep apnea and fatty liver can sometimes exist without obvious symptoms. Some people don’t remember episodes of nocturnal breathing because they repeatedly wake briefly and then fall asleep. They may only experience loud snoring, morning headaches, dry mouth, daytime sleepiness, or difficulty concentrating. Some patients may not experience excessive daytime sleepiness.
According to the NIH, fatty liver often doesn’t have any obvious symptoms in its early stages. It’s often detected during routine checkups, liver enzyme tests, or ultrasounds. However, even normal liver enzymes don’t completely rule out all types of liver disease.
According to the NIH, fatty liver often doesn’t have any obvious symptoms in its early stages. It’s often detected during routine checkups, liver enzyme tests, or ultrasounds. However, even normal liver enzymes don’t completely rule out all types of liver disease.
The effects of untreated sleep apnea aren’t limited to just sleep and daytime energy. Frequently reduced oxygen levels at night are linked to oxidative stress, insulin resistance, and changes in fat metabolism, which may contribute to fatty liver in some people. However, not every sleep apnea patient develops liver disease, and more robust research is needed to establish the link. If you experience symptoms such as loud snoring, sleep apnea pauses, or excessive daytime sleepiness, consult a doctor. Timely treatment for sleep apnea and management of metabolic risks are crucial for your overall health.