Coffee consumption impacts sleep, mood, and metabolic health

Research and nutritional experts highlight the complex relationship between coffee consumption, mental state, and sleep. Caffeine works by blocking adenosine receptors, which temporarily masks fatigue rather than providing actual energy. This mechanism explains why some individuals experience sleepiness instead of alertness, particularly due to caffeine tolerance, genetic metabolic differences, or existing sleep deprivation.

Studies from Showa University published in the journal Nutrients indicate that even the aroma of freshly brewed coffee can improve mood. Exposure to the scent for five minutes was linked to reduced feelings of anxiety, fatigue, and depression, as well as increased relaxation indices in brain activity.

Nutritionist Laure Hyvernat suggests that the healthiest way to consume coffee is as strong black coffee, such as espresso or ristretto, without added sugar or milk to maximize polyphenol intake. She notes that while milk-based drinks are not inherently harmful, they may be less suitable for individuals with specific hormonal or insulin-related conditions. Conversely, instant coffee and decaf are identified as less healthy options due to high-temperature roasting processes that can increase acrylamide levels.