A recent scientific study tracking the daily routine of six people has revealed that controlling light exposure throughout the day — by increasing light in the morning and reducing it in the evening — may help maintain an ideal weight and reduce the risk of diabetes and certain types of cancer by supporting the body's circadian rhythm. The experiment, which used light sensors to monitor participants around the clock, showed that the balance between natural daylight and nighttime darkness plays a fundamental role in regulating vital bodily functions. Every cell contains an internal clock that operates on a cycle close to 24 hours and functions best when adhering to a regular day-night rhythm. Researcher Anne Sheldon explains that these clocks control multiple processes, including digestion, learning, cell repair, and sleep preparation, and they rely on daily light signals to synchronize with the environment. Blue light emitted from electronic screens, in particular, affects this system, as light-sensitive retinal cells send signals to the main control center in the brain. Researcher Stuart Pearson indicates that exposure to bright light in the morning helps to reset the circadian clock, whereas bright light in the evening acts as an alarm similar to the effect of caffeine, which delays sleepiness and reduces the secretion of melatonin, the sleep-related hormone. Recent studies link disruption of light exposure to an increased risk of obesity, type 2 diabetes, heart disease, and psychological and neurological disorders. Research from the University of Exeter and the Barcelona Institute for Global Health also suggests that exposure to light during sleep, even from external sources like streetlights, may be associated with a higher risk of depression and certain types of cancer.
