How well your immune system works can depend on the time of day

By Annie Curtis, Senior Lecturer, Medicine and Health Sciences, RCSI University of Medicine and Health Sciences

When microorganisms – such as bacteria or viruses – infect us, our immune system jumps into action. It’s highly trained to sense and eliminate infections and clear up any damage caused by them.

It’s typically assumed our immune systems work the exact same way regardless of whether an infection occurs during the day or at night. But research spanning over half a century now shows our bodies actually respond differently at day and night. The reason for this is our body clock, and the fact that each cell in…

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