There is a reason October feels different. The air cools, the light softens, and something in the body shifts in response. Leaves changing color is the version of seasonal change we are taught to notice, but inside the human body, the transition from summer into autumn triggers a cascade of physiological adjustments that are equally dramatic, if far less celebrated. Understanding what those changes are, and how to support the body through them, is one of the more practical things any of us can do for our long-term health.

There is something quietly demanding about the transition into autumn. The ease of summer dissolves almost overnight, replaced by renewed professional obligations, school schedules, and a subtle but measurable physiological pressure most of us mistake for ordinary stress. But the body's experience of fall is more nuanced than that.