Why doesn't coffee help anymore?

A single cup in the morning used to be enough. Nowadays, you drink the same amount, sometimes more, but the feeling of "waking up" barely materializes. Instead, coffee is sometimes followed by heart palpitations, anxiety, or a crash an hour later. If coffee has stopped working as it used to, it's rarely a coincidence – it's often a sign that the adrenal glands and cortisol system are already under pressure.

Caffeine works, in part, by stimulating the release of cortisol and adrenaline – that's a large part of why it creates a feeling of alertness. The problem is that if the body is already producing too much cortisol due to chronic stress, sleep deprivation, or hormonal changes, coffee simply has less "room" to add another peak. The effect becomes less noticeable, because the system is already activated.

During prolonged stress, the cortisol system can become less responsive over time – the body gets used to high levels, and the natural circadian rhythm (high cortisol in the morning, lower in the evening) can become flatter. This means that the natural morning energy you would otherwise have is weaker, forcing coffee to work against an already sluggish start instead of enhancing a natural upswing.

Progesterone has a calming effect on the nervous system, and when levels drop during perimenopause, some of the natural balancing effect against cortisol is lost. This makes the stress system generally more sensitive – which also affects how the body reacts to caffeine. Many therefore experience that coffee causes more heart palpitations, anxiety, or energy crashes during this phase of life, even if the amount of caffeine is unchanged.

Coffee on an empty stomach can cause a quick but short-lived blood sugar spike, followed by a drop that is often experienced as even greater fatigue than before. If you already have a sensitivity to blood sugar fluctuations – common in connection with hormonal changes – this can reinforce the feeling that coffee "isn't enough" or even makes you more tired afterward.

• Wait 60–90 minutes after waking up before drinking coffee, allowing your natural cortisol peak to work first – this means the caffeine complements rather than clashes with the body's own rhythm.

• Drink coffee with food, not on an empty stomach, to dampen blood sugar fluctuations.

• Gradually reduce the amount rather than abruptly, if you suspect your adrenals are overloaded.

• Prioritize the root cause – sleep, stress management, and recovery – instead of compensating for fatigue with more caffeine.

• Try replacing your afternoon coffee with, for example, a short walk or natural light, both of which can provide a natural boost without further burdening the cortisol system.

If coffee has stopped working as it used to, it's worth seeing it as information rather than an annoyance. The body is signaling that the existing stress load is already high, and that the solution is likely to be found in recovery – not in the next cup.