Research links inflammation and nighttime light to heart damage

Recent studies involving data from the UK Biobank suggest that both chronic inflammation and nighttime light exposure may be linked to structural and functional changes in the heart.

Research conducted by the MRC Laboratory of Medical Sciences and Imperial College London found that high levels of the blood marker GlycA, which indicates chronic inflammation, are associated with smaller heart chambers, thicker walls, and reduced pumping efficiency. Over a 15-year follow-up, individuals with higher inflammation levels faced a roughly 43% increased risk of serious cardiovascular events. Factors such as smoking, psychological stress, and poor socioeconomic conditions were linked to higher inflammation, while physical activity and healthy diets were associated with more favorable levels.

Separately, a study led by Tulane University published in the European Heart Journal indicates that exposure to more than 3 lux of light during the night may contribute to left ventricular wall thickening. This process, described as heart remodeling, can reduce internal chamber space and impair the heart muscle's ability to relax. Researchers suggest mitigating nighttime light through the use of blackout curtains and warmer lighting tones, though they note the study was observational and primarily focused on a specific demographic.