Cellular Composition of Blood Varies by Season

“In the winter, the study found, your blood contains a denser blend of immune responders, while summer veins swim with fat-burning, body-building, water-retaining hormones.”

This sounds curiously similar to a passage from Suwen Chapter 13 describing a yearly rhythmic fluctuation in blood quality and immunity (camp & guard qi). “when heaven is warm and when the sun is bright, the blood is rich in liquid and the guard qi is at the surface. When heaven is cold and the sun is hidden, the blood congeals and the guard qi is in the depth”.

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