New research suggests that sitting near a window can help people with type 2 diabetes better manage their insulin levels. Published in Cell Metabolism, the study found that being exposed to natural light—even indoors—affects how our bodies process sugar and use energy.
Most people in Western countries spend 80% to 90% of their time under artificial lighting, which is often much dimmer than sunlight. Natural daylight plays an essential role in regulating our internal body clock, known as the circadian rhythm.
This internal clock impacts many bodily processes, including digestion and hormone release. When it goes out of sync, it can lead to poor insulin function and blood sugar control, both of which are key challenges in type 2 diabetes.
To investigate the effect of natural light on diabetes, researchers invited 13 adults with type 2 diabetes to participate in a controlled study. Each person spent two separate 4.5-day periods in the same office setting. During one period, they worked in front of large windows with daylight shining in, while in the other, the windows were covered, providing only typical indoor lighting. The participants maintained similar diets and continued their regular diabetes medications.
Even though average blood sugar levels didn’t show significant differences between the two conditions, those exposed to natural light experienced more time within the healthy glucose range. Their blood sugar levels fluctuated less and stabilized more throughout the day.
The research also revealed that exposure to daylight influenced the metabolism, with participants burning more fat and fewer carbohydrates for energy. Muscle tissue samples showed that sunlight helped synchronize genes responsible for the body’s internal clocks, which may improve how our cells respond to insulin.
Researchers concluded that this better synchronization could enhance nutrient processing. However, they emphasized that natural light should not replace medications or standard diabetes management techniques like diet and exercise.
The study noted some limitations, such as the small sample size. Researchers call for more extensive studies to confirm the findings and determine the ideal amount of natural light exposure for better diabetes management.
This research also underscores the importance of considering how indoor environments affect our health, particularly the lack of access to natural light in many office settings.
