Study Finds Natural Daylight Improves Blood Sugar Control in Diabetics

A new scientific study suggests that exposure to natural daylight can significantly improve metabolic health in people with type 2 diabetes, helping them maintain better blood sugar control. Researchers found that individuals who spent more time in natural light had more stable blood glucose levels throughout the day, with fewer fluctuations.

The study, conducted by researchers from the University of Geneva (UNIGE) in Switzerland and Maastricht University in the Netherlands, was published in the journal Cell Metabolism. According to the findings, people exposed to natural daylight maintained blood sugar levels within the normal range for longer periods compared to those who stayed under artificial lighting.

In addition to improved glucose control, researchers observed that participants exposed to daylight had slightly higher levels of melatonin in the evening. Melatonin is a hormone that plays a key role in regulating sleep and the body’s internal clock, also known as the circadian rhythm. Better regulation of this hormone may contribute to a more balanced metabolism. The study also found enhanced fat oxidation, meaning the body was more efficient at converting fat into energy.

Disruption of circadian rhythms has long been linked to metabolic disorders such as obesity and type 2 diabetes. The researchers explained that natural light helps synchronise the body’s internal clock, improving coordination between the brain and various organs involved in metabolism. This improved alignment may explain the better blood sugar regulation observed in the study.

For the research, the team recruited 13 volunteers aged 65 and above, all diagnosed with type 2 diabetes. The participants spent 4.5 days in specially designed living environments. Some rooms were illuminated with natural daylight through large windows, while others relied solely on artificial lighting. After a break of at least four weeks, participants returned and experienced the alternate lighting condition.

Throughout the study, researchers collected blood and muscle samples before, during, and after each lighting exposure. They analysed molecular clocks in muscle cells, as well as changes in blood lipids, metabolites, and gene activity. The results clearly showed that natural light positively influenced both the body’s internal clock and metabolic processes.

The findings suggest that simple lifestyle changes, such as spending more time in daylight, could support better blood sugar management in people with type 2 diabetes. While more research is needed, the study highlights the potential of natural light as a supportive, non-invasive approach to improving metabolic health.

With Inputs From IANS