/blog/en/tags/coffee/Recent content in Coffee on 飛脚 / HIKYAKUHugoenWed, 22 Apr 2026 00:00:00 +0000/blog/en/posts/coffee-adenosine-afternoon-koku/Wed, 22 Apr 2026 00:00:00 +0000/blog/en/posts/coffee-adenosine-afternoon-koku/<p>What decides when you drink your coffee?</p> <p>&ldquo;First thing in the morning.&rdquo; Most people do this. But from the perspective of precision nutrition and circadian rhythm, that first cup is likely consumed during <strong>the least effective window of the day</strong>.</p> <h2 id="the-morning-cortisol-peak">The morning cortisol peak</h2> <p>Immediately after waking, your body autonomously surges cortisol production. This is called the <strong>CAR (Cortisol Awakening Response)</strong>. It peaks 30–45 minutes after waking and gradually declines over the next two hours.</p>