IS DRINKING COFFEE HEALTHY? FACTS ABOUT COFFEE AND CAFFEINE

Coffee is one of the most widely consumed beverages in the world. For many years, it has been the subject of considerable debate, mainly because of its caffeine content and its effects on the nervous system, blood pressure and heart function.

Today, a large body of research is available on the relationship between regular coffee consumption and human health. The findings indicate that for most healthy adults, moderate coffee consumption is considered safe. Moreover, numerous observational studies have associated regular coffee consumption with favorable health outcomes.

However, this does not mean that coffee treats diseases or that everyone should drink it. Individual responses to caffeine can vary considerably.

WHAT DOES COFFEE CONTAIN?

The best-known component of coffee is caffeine. It is a substance that stimulates the central nervous system. It can increase alertness, improve concentration and temporarily reduce feelings of tiredness and sleepiness.

However, coffee is not simply a source of caffeine. It also contains many other naturally occurring compounds, including polyphenols, chlorogenic acids, trigonelline and diterpenes.

For this reason, the effects of coffee on the body should not be attributed solely to caffeine.

The amount of caffeine in a cup of coffee can vary considerably depending on the type of coffee beans, brewing method, coffee-to-water ratio and serving size.

As a general guide, a 200 ml cup of filtered coffee may contain around 90 mg of caffeine, while a 60 ml espresso may contain around 80 mg of caffeine. Actual values can vary substantially.

HOW MUCH COFFEE CAN YOU SAFELY DRINK?

When considering coffee consumption, monitoring total caffeine intake is more useful than simply counting cups.

For most healthy adults, a single dose of caffeine of up to 200 mg is generally considered not to raise safety concerns.

A total daily intake of up to approximately 400 mg of caffeine from all sources is also generally considered not to raise safety concerns for healthy adults.

However, this does not mean that 400 mg is a recommended daily target. It is an upper level that is generally considered safe for the healthy adult population.

It is also important to remember that coffee is not the only source of caffeine. Caffeine can also be found in tea, energy drinks, cola, chocolate, certain dietary supplements and some medicines.

COFFEE AND LONGEVITY

One of the most interesting findings from population studies is the observed association between regular coffee consumption and lower all-cause mortality.

In large scientific analyses, drinking approximately 3 to 4 cups of coffee per day has often been associated with favorable outcomes compared with not drinking coffee at all.

However, these findings need to be interpreted correctly.

They do not mean that drinking three cups of coffee every day will automatically extend your life. Most of these results come from observational studies. Researchers can therefore identify statistical associations, but they cannot always establish a direct cause-and-effect relationship.

COFFEE AND HEART HEALTH

The relationship between coffee and cardiovascular health is complex.

Contrary to a common belief, moderate coffee consumption among healthy adults is not currently considered unequivocally harmful to the heart.

Studies have examined the relationship between coffee consumption and conditions such as coronary heart disease, heart failure, stroke, cardiac arrhythmias and myocardial infarction.

The results are not identical for all cardiovascular conditions. Some analyses show favorable associations, while others find no significant relationship, and for certain outcomes potentially unfavorable associations have been reported with higher levels of consumption.

Therefore, scientific findings should not be simplified into the statement that coffee "protects the heart."

COFFEE AND BLOOD PRESSURE

Caffeine can cause a temporary increase in blood pressure, particularly in some individuals and in people who do not consume caffeine regularly.

Individual responses can vary considerably.

People with hypertension, cardiac arrhythmias or other cardiovascular conditions should pay attention to how their body responds to coffee and follow the advice of their healthcare professional.

COFFEE AND TYPE 2 DIABETES

In numerous observational studies, regular coffee consumption has been associated with a lower risk of developing type 2 diabetes.

However, this does not mean that coffee prevents or treats diabetes.

How coffee is consumed also matters.

Black coffee contains virtually no sugar, while a large coffee drink containing flavored syrups, sugar, whipped cream or other high-calorie additions is a completely different product from a nutritional perspective.

Therefore, when discussing the potential benefits of coffee, it is important to distinguish between coffee itself and the ingredients added to it.

COFFEE AND THE LIVER

Interesting findings have also been reported regarding liver health.

In observational studies, regular coffee consumption has been associated with a lower risk of certain chronic liver conditions.

However, this does not mean that coffee is a treatment for liver disease.

Anyone with abnormal liver test results or a diagnosed liver condition should receive appropriate medical evaluation and treatment.

COFFEE, CONCENTRATION AND FATIGUE

One of the best understood effects of caffeine is its action on the central nervous system.

Caffeine can:

• increase alertness,
• reduce feelings of sleepiness,
• improve concentration,
• influence the perception of fatigue.

This is why many people drink coffee in the morning or during periods of intensive work.

However, it is important to remember one thing: caffeine does not replace sleep.

It may temporarily reduce the feeling of tiredness, but the body still requires sufficient rest and recovery.

COFFEE AND SLEEP

This is one of the most important reasons to control both the amount and timing of coffee consumption.

Even approximately 100 mg of caffeine consumed close to bedtime can affect the duration and quality of sleep in some individuals.

Sensitivity to caffeine varies considerably.

One person may drink coffee in the late afternoon and fall asleep without difficulty, while another may experience problems falling asleep several hours after consuming the same amount of caffeine.

People experiencing sleep problems should therefore pay particular attention to the time of day when they drink their last coffee.

DOES COFFEE DEHYDRATE THE BODY?

The common statement that "coffee dehydrates the body" is an oversimplification.

Caffeine can have a mild diuretic effect. However, this does not mean that moderate coffee consumption by a healthy person automatically causes dehydration.

Under normal conditions, coffee itself also supplies the body with fluid.

This does not mean that coffee should replace water as the primary beverage in a healthy diet.

FILTERED OR UNFILTERED COFFEE?

The way coffee is prepared can also make a difference.

Coffee naturally contains diterpenes. With some brewing methods, larger amounts of these compounds can remain in the finished beverage.

Paper filters retain a significant proportion of diterpenes.

This may be particularly relevant to people who need to pay attention to their cholesterol levels, as high consumption of certain types of unfiltered coffee may adversely affect blood lipid levels.

For people who drink substantial amounts of coffee and have elevated cholesterol, coffee prepared using a paper filter may therefore be a sensible option.

COFFEE DURING PREGNANCY

Greater caution should be taken during pregnancy.

A total caffeine intake of up to 200 mg per day from all sources is generally considered a level that does not raise safety concerns for the fetus.

This is approximately half of the upper daily level commonly applied to healthy adults who are not pregnant.

It is important to count caffeine from all sources, including not only coffee but also tea, chocolate, energy drinks, cola and other products containing caffeine.

DOES COFFEE CAUSE CANCER?

Based on current scientific knowledge, there is no basis for making a general claim that normal coffee consumption causes cancer.

Moreover, large epidemiological analyses have associated coffee consumption with a lower risk of certain types of cancer.

This does not mean, however, that coffee is an anti-cancer treatment or that it prevents cancer.

An observed statistical association is not sufficient to conclude that drinking coffee directly prevents a particular type of cancer.

WHEN CAN COFFEE BECOME A PROBLEM?

Coffee does not affect everyone in the same way.

Even an amount of caffeine considered safe for the general healthy population may be poorly tolerated by a particular individual.

High caffeine intake or individual sensitivity may be associated with:

• difficulty falling asleep,
• poorer sleep quality,
• excessive stimulation,
• temporary increases in blood pressure,
• impaired well-being in people who are particularly sensitive to caffeine.

For this reason, 400 mg of caffeine per day should not be treated as a target.

If someone feels well drinking one or two cups of coffee per day, there is no reason to increase consumption simply because some studies have reported favorable associations at higher levels of intake.

WHAT ABOUT DECAFFEINATED COFFEE?

Decaffeinated coffee can be a good choice for people who enjoy the taste and aroma of coffee but are sensitive to caffeine.

Decaffeinated coffee still contains many of the naturally occurring compounds found in coffee, although its caffeine content has been significantly reduced.

Interestingly, some of the favorable associations observed in scientific studies have also been reported for decaffeinated coffee.

This is one of the reasons researchers believe that the properties of coffee are not related exclusively to caffeine.

SO, IS DRINKING COFFEE HEALTHY?

For most healthy adults, moderate coffee consumption can be part of a balanced diet.

The key facts are:

Up to 400 mg of caffeine per day from all sources is generally considered an amount that does not raise safety concerns for most healthy adults.

During pregnancy, the upper level is lower, at up to 200 mg of caffeine per day from all sources.

In numerous observational studies, regular coffee consumption has been associated with favorable outcomes relating to all-cause mortality and certain metabolic, neurological and liver conditions.

Caffeine increases alertness and reduces sleepiness, but when consumed late in the day it may interfere with sleep.

Filtered coffee may be a more suitable choice for people who need to pay particular attention to their cholesterol levels.

Decaffeinated coffee can be a useful alternative for those who are sensitive to caffeine.

SUMMARY

Coffee is neither a miracle product that improves health nor a beverage that healthy people necessarily need to avoid. For most healthy adults, moderate consumption is considered safe, and numerous observational studies have identified favorable associations between regular coffee consumption and certain aspects of health.

Coffee cannot, however, replace a balanced diet, sufficient sleep, regular physical activity or an adequate intake of essential nutrients. When an individual's diet does not meet their nutritional requirements or when specific deficiencies have been identified, appropriately selected dietary supplementation may complement a healthy lifestyle.

It is important to choose reliable dietary supplements with clearly specified ingredients, dosage and origin, rather than products that promise rapid or unrealistic results. Supplementation should address genuine individual needs. In cases of confirmed deficiencies, chronic medical conditions, regular medication use or specific nutritional requirements, the choice of supplements should be discussed with a doctor or qualified dietitian.

Coffee can therefore remain an enjoyable part of everyday life, while the foundations of good health should continue to be a balanced diet, adequate recovery, regular physical activity and, where appropriate, carefully selected high-quality supplementation.