Scientists Discover Link Between Lighting Conditions and Blood Test Results
A new study from Tyumen State Medical University has uncovered a clear connection between daily light exposure and blood health. Researchers tracked 85 students to see how different lighting patterns affected key blood measurements. Their findings suggest that when and how people experience light could play a bigger role in wellbeing than previously thought.
The team monitored participants aged 18 to 25 using actimeters with built-in light sensors. These devices recorded physical activity, white light, and blue light exposure around the clock. Students who spent days under bright light but kept evenings and nights dim showed higher haemoglobin levels and more concentrated haemoglobin in their red blood cells.
In contrast, those exposed to more blue light later in the day had lower haemoglobin and greater inconsistency in red blood cell size. The study also found that delaying exercise and bedtime to later hours was tied to poorer blood results overall. This area of research—sometimes called 'light hygiene'—remains relatively unexplored. The project moved faster than usual thanks to funding from the Arctic Light mega-grant. Scientists involved have stressed the importance of regular sleep schedules, daytime sunlight, and cutting back on evening screen use.
The results add weight to existing advice about healthy daily routines. Keeping a steady sleep pattern, getting enough natural light by day, and limiting blue light at night may help maintain better blood health. The findings could influence future guidelines on lifestyle habits and lighting environments.
