What Daily Coffee May Do to Your Body — Insights on Hormones, Heart, and Sleep

Hormones: Energy, Stress, and Balance

Coffee’s most active compound, caffeine, directly affects the nervous system by blocking adenosine, a chemical that promotes relaxation and sleepiness. In response, the body increases alertness—but it can also stimulate the release of stress-related hormones like cortisol and adrenaline.

For some people, moderate coffee intake may temporarily boost focus and energy regulation. However, frequent high intake—especially on an empty stomach or during periods of stress—may contribute to heightened cortisol levels, which can affect mood stability and energy fluctuations throughout the day.