Coffee and health: facts and myths

Coffee: some people drink it occasionally, while others cannot imagine life without it. A strong black cup to begin the day, a cappuccino after lunch or a delicious latte in a café — all are familiar pleasures. Coffee is also surrounded by myths and has stirred debate since its arrival in Europe. Have you wondered how it affects your wellbeing, or wanted to understand its advantages and drawbacks before switching on the coffee machine?

Coffee's familiar effects

Its best-known quality is stimulation. Caffeine is a major reason people around the world reach for a hot coffee: it can reduce the feeling of fatigue and help maintain alertness and concentration. Its effects on heart rate, memory and performance vary with the person and dose.

A fragrant cup can be a pleasant way to begin a task. Caffeine also interacts with brain signalling systems, including those involving dopamine, which helps explain the interest in coffee and mood. That does not mean the drink makes every day better for everyone.

Coffee and health research

Researchers have explored coffee in relation to Parkinson's disease, Alzheimer's disease and type 2 diabetes. Some studies report favourable associations, but these are not proof that coffee prevents the conditions or slows their progression.

Caffeine can have a modest effect on airway function, which has prompted interest in asthma research. Coffee is not a replacement for an inhaler, allergy treatment or urgent care for breathing difficulties.

Studies also investigate coffee, antioxidants and inflammation in relation to cancer outcomes, including liver and skin cancers. The evidence is not a guarantee of protection.

Caffeine can be an ingredient in some headache medicines and may help certain headaches, but it can also trigger symptoms or contribute to withdrawal headaches. Persistent or severe headaches need appropriate advice rather than simply another cup.

Other possible advantages

If you are managing your weight, unsweetened coffee can be a low-calorie drink. Caffeine can temporarily influence metabolism and fat mobilisation, but coffee does not replace exercise or a balanced diet.

A quiet coffee break can still be a welcome moment of relaxation between activities. Enjoy the ritual without expecting it to do the work of a weight-management plan.

When can coffee cause problems?

Like most things, coffee has both attractions and drawbacks. Pregnancy calls for a lower caffeine limit and individual medical advice; counting cups alone is unreliable because their caffeine content varies.

People with high blood pressure or other cardiovascular conditions should discuss suitable intake with their clinician rather than assuming everyone must either avoid coffee entirely or can drink it freely.

Too much caffeine may cause stomach discomfort, poor sleep, nervousness, low mood or muscle tremor. Consider all sources of caffeine, not coffee alone.

You may have heard that coffee “washes out” vitamins and minerals such as calcium and magnesium. The picture is more complicated, and moderate consumption is not in itself proof of a deficiency. A varied diet and attention to persistent symptoms are more useful than assuming coffee is always to blame.

For many healthy adults, two or three ordinary cups can fit comfortably into a balanced routine, but personal sensitivity matters. Drink thoughtfully, enjoy the flavour and adjust the amount if it affects your sleep or wellbeing.