Sleep is one of the most important parts of good health, yet it is often overlooked.
Many people with type 2 diabetes focus on eating well, taking medicine, and exercising, but they may not realize that the way they sleep could also affect the health of their liver.
A new study suggests that poor sleep at night and taking long daytime naps may increase the risk of developing metabolic dysfunction-associated steatotic liver disease, or MASLD. The research was published in Diabetology & Metabolic Syndrome.
MASLD is the new name for what was previously called non-alcoholic fatty liver disease in many people. It happens when too much fat builds up inside the liver in people whose condition is linked to problems such as obesity, insulin resistance, or type 2 diabetes rather than heavy alcohol use.
Over time, the liver can become inflamed and scarred, raising the risk of liver failure, liver cancer, and heart disease.
Researchers from the First Affiliated Hospital of Wenzhou Medical University in China followed 1,900 adults aged 18 to 85 with type 2 diabetes for an average of 3.2 years. They carefully examined participants’ sleeping habits, including sleep quality at night and how long they napped during the day.
The team found that several unhealthy nighttime sleep patterns were linked with a much higher chance of developing MASLD. People with poor nighttime sleep had a significantly higher risk than those who slept well.
Long daytime naps of more than 30 minutes also increased the risk. The highest risk was seen in people who combined poor nighttime sleep with long naps, whose likelihood of developing MASLD was more than three times higher than people who slept well at night and took short naps.
The researchers also found that adding information about sleep to an existing fatty liver prediction tool improved its ability to identify people at risk. This suggests that doctors may be able to detect high-risk patients earlier simply by asking about their sleeping habits.
Scientists believe poor sleep may affect hormones that control appetite, blood sugar, inflammation, and the body’s internal clock. These changes may encourage fat to build up in the liver. Long naps may also reflect poor nighttime sleep or other underlying health problems.
The study cannot prove that poor sleep directly causes MASLD because it observed people rather than assigning sleep habits. However, the large number of participants and several years of follow-up make the findings important. Future studies will need to test whether improving sleep can lower liver disease risk.
Overall, the research suggests that sleep deserves the same attention as diet and exercise in people with type 2 diabetes. Improving sleep quality, keeping a regular bedtime, and avoiding long daytime naps may become simple ways to help protect liver health alongside standard medical care.
This was a large, well-designed follow-up study, which strengthens confidence in the findings. However, because it was observational, other lifestyle factors may also have contributed to the results. Even so, the consistent link between poor sleep and higher liver disease risk makes the findings clinically meaningful and supports including sleep assessments in diabetes care.
If you care about liver health, please read studies about simple habit that could give you a healthy liver, and common diabetes drug that may reverse liver inflammation.
For more information about health, please see recent studies about simple blood test that could detect your risk of fatty liver disease, and results showing this green diet may strongly lower non-alcoholic fatty liver disease.
Source: First Affiliated Hospital of Wenzhou Medical University.
