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Bad weather and rain are at the heart of all discussions. After a long, cold winter and a virtually non-existent start to spring, grey skies predominate in France.

Do these temperature variations impact our mood?

Is it known whether the weather affects our mental health?

What are the effects of light on our health and on human physiology?

To answer your questions, Claude Gronfier, head of Inserm research, studied the effect of light on the circadian biological clock and the non-visual functions (cognition, mood, memory, cardiovascular system, temperature, etc.).