Staff picks
Should you start your morning with tea or coffee? During office work, which option is better to maintain energy and focus? And when it comes to long-term good health, which choice is more sensible?
Such questions come to the minds of millions of people not only in India but all over the world. This is because tea and coffee have become an important part of daily life. The common belief is that tea is light, balanced and relatively safe for the body, while many people believe that coffee is more effective in increasing energy and improving focus and performance.
Because of this, many different claims about tea and coffee are also seen on social media and the internet. Somewhere it is said that coffee is harmful for the heart, while elsewhere it is claimed that drinking too much tea can cause iron deficiency in the body. With such conflicting claims, it becomes difficult to understand what is based on scientific facts and what is just a myth.
But the answer to this question is not as simple as saying “tea is better” or “coffee is more beneficial.” In reality, both drinks contain hundreds of natural bioactive compounds that affect the body in different ways. Their benefits and possible risks depend on how much you consume in a day, what type of tea or coffee you drink, whether you add sugar, milk or cream and also your age, health condition and lifestyle.
This is why it is not scientifically correct to call any one option the best for everyone. Therefore, in this article, we will understand only on the basis of scientific evidence and reliable research what the real difference between tea and coffee is, how both work in the body and in which situations each option may be more suitable for you. Every important piece of information in this article is based on trusted institutions and peer-reviewed research, so that you can clearly understand the difference between facts and myths.
What are tea and coffee, after all?
At first glance, tea and coffee may look like two simple beverages, but from a scientific point of view, their origin, composition, and effects on the body are quite different.
Tea is mainly prepared from the leaves of a plant called Camellia sinensis. From this single plant, different types of tea such as green tea, black tea, oolong tea, and white tea are produced. The difference between them is not the plant itself, but the processing of the leaves, which changes their taste and properties.
Coffee, on the other hand, is made from the seeds of the Coffea plant, which are roasted to produce coffee beans. There are two main varieties of coffee in the world: Arabica and Robusta. Their taste, aroma, and caffeine content can vary.
Although both tea and coffee contain caffeine, the other natural plant compounds in them are different. This difference determines how both work in the body and how their health effects may vary from each other.
What nutrients and active compounds are found in tea and coffee?
People often think that the most important component of tea and coffee is only caffeine, but scientifically this belief is not completely correct. In reality, both beverages contain several natural compounds that can act as antioxidants, help reduce inflammation, and protect cells from oxidative damage. Therefore, their effects are not limited to caffeine alone.
Major compounds found in tea
Coffee contains not only caffeine but also several other active compounds. These include chlorogenic acid, diterpenes (cafestol and kahweol), and various polyphenols. Among these, chlorogenic acid is one of the most studied antioxidants. Scientists believe it may influence glucose metabolism in the body and help reduce oxidative stress.
How does caffeine work in the body?
It is almost impossible to talk about tea and coffee without mentioning caffeine. This is the natural compound mainly responsible for the immediate effects of both beverages.
Caffeine is a natural stimulant that temporarily blocks the effect of a chemical in the brain called adenosine. Under normal conditions, adenosine gradually builds up throughout the day and signals the body that it is time to rest and feel tired.
But when caffeine blocks adenosine receptors, this tiredness signal is suppressed for a while. As a result, a person feels more alert, awake, and energetic. This is why people often consume tea and coffee in the morning or during work.
What does NIH say?
According to the National Institutes of Health (NIH) of the United States, caffeine may help temporarily improve mental alertness, reaction time, and the ability to focus.
However, the effect of caffeine can vary from person to person. This is because the metabolism of caffeine in the body also depends on genetic factors.
How much caffeine is found in tea and coffee?
This question is often asked: which contains more caffeine, tea or coffee?
The actual amount depends on how the drink is prepared, but generally a cup of black coffee contains more caffeine than a cup of black tea.
On average:
- One cup of coffee may contain about 80–100 mg of caffeine.
- One cup of black tea may contain about 40–50 mg of caffeine.
- Green tea usually contains even less caffeine than this.
However, these are not fixed values because they can vary depending on coffee beans, type of tea, brewing time, and serving size.
How much caffeine is considered safe per day?
This is the most important question because the effect of any beverage also depends on its quantity.
FDA guidelines (2022)
According to the U.S. Food and Drug Administration (FDA), for most healthy adults, up to about 400 mg of caffeine per day is generally considered safe.
This is roughly equal to four to five cups of coffee, although the actual amount depends on the type of drink.
The FDA is one of the most respected food and drug regulatory authorities in the world, and its guidelines are issued after reviewing extensive scientific evidence.
For pregnant women, breastfeeding mothers, people with certain heart conditions, and children, the safe limit of caffeine may be different. Therefore, they should consume it only as per a doctor’s advice.
Are tea and coffee good sources of antioxidants?
The short answer is yes, but the antioxidants found in both are not the same. This is why their effects on the body may also differ to some extent.
To understand this, it is important to first know about oxidative stress. It is a process in the body in which free radicals can damage cells. If this condition continues for a long time, it is linked to an increased risk of several chronic diseases.
That is why scientists have long been trying to understand whether the antioxidants present in tea and coffee can play an important role in protecting the body from this damage.
2019 review
A review of several scientific studies published in 2019 found that both tea and coffee are important sources of polyphenols. These natural compounds can influence various biological processes related to inflammation and oxidative stress in the body.
However, researchers also emphasized an important point. According to them, the presence of antioxidants in a drink does not necessarily mean it will definitely prevent any disease. In reality, its effect on a person’s health depends on overall lifestyle, a balanced diet, regular physical activity, and other risk factors.
Is tea or coffee better for heart health?
When it comes to the health effects of tea and coffee, heart health is one of the most discussed topics. That is why extensive scientific research has been conducted on this subject over several decades.
It was once believed that caffeine in coffee could be harmful to the heart. However, in recent years, large and high-quality studies have significantly changed this perception and suggest that the real picture is much more complex than previously thought.
Major study (2022)
A large study published in 2022 in the European Journal of Preventive Cardiology analyzed health data from millions of participants. Researchers tried to understand whether coffee consumption is linked to heart health and the risk of death.
The study found that people who consumed moderate amounts of coffee without excessive sugar had a relatively lower risk of heart disease and premature death.
However, the researchers also pointed out an important limitation. Since this was an observational study, it cannot be concluded that coffee alone caused these benefits. It is possible that other healthy habits and lifestyle factors of the participants also influenced the results.
It is worth noting that the European Journal of Preventive Cardiology is a respected peer-reviewed scientific journal associated with the European Society of Cardiology, and its research is widely trusted in the medical community.
What do studies say about tea?
Like coffee, many scientific studies have also been conducted on the health effects of tea, especially to understand whether the natural compounds in tea can have a positive impact on heart health.
2020 Cochrane Review
A 2020 Cochrane review of available scientific evidence found that flavonoids present in tea may have positive effects on some important biological markers related to heart health.
However, the review also clearly stated that the results of different studies were not completely consistent. Therefore, it cannot yet be said with certainty that drinking tea alone reduces the risk of heart disease.
It is also important to note that Cochrane is considered one of the most trusted scientific organizations in the world because it publishes systematic reviews based only on high-quality research studies.
Frequently Asked Questions (FAQs)
Many claims are made about weight loss and both tea and coffee. Some people call green tea a “fat burner,” while others consider black coffee the best way to lose weight. However, scientific research shows a different picture.
Caffeine may temporarily increase energy expenditure and alertness. At the same time, catechins in green tea, especially EGCG, have also been widely studied. However, this does not mean that drinking only tea or coffee will automatically lead to weight loss.
A 2020 systematic review published by Cochrane analyzed available studies on weight loss with green tea.
The researchers found that some people experienced a small reduction in weight or body fat, but this reduction was not large enough to be considered clinically significant.
Cochrane is one of the most trusted scientific organizations in the world because it publishes systematic reviews of only high-quality research.
Therefore, current scientific evidence suggests that weight loss cannot be achieved by relying only on tea or coffee without a healthy diet and regular exercise.
In 2014, researchers from Harvard T.H. Chan School of Public Health analyzed several large studies.
The main finding was that people who increased their coffee intake over time had a relatively lower risk of Type 2 diabetes.
However, the researchers also clarified that this was an observational study. Therefore, it does not prove that coffee directly prevents diabetes. Other lifestyle factors may also have influenced the results.
Harvard T.H. Chan School of Public Health is considered one of the most prestigious institutions in the field of public health research.
Several studies have also shown a positive association between tea, especially green tea, and reduced risk of diabetes. However, the current evidence is not strong enough for doctors to recommend tea specifically for diabetes prevention.
More high-quality clinical trials are still needed on this topic.
Many large studies have been conducted on this topic.
Some observational studies have found a lower risk of Parkinson’s disease among regular coffee drinkers. Similarly, some studies have suggested a possible link with a reduced risk of Alzheimer’s disease.
However, it has not yet been proven that coffee directly prevents these diseases.
Scientists clearly state that current evidence shows only an association, not a cause.
This is a topic where a lot of confusion exists. In reality, tannins present in tea can reduce the absorption of non-heme iron from food to some extent.
Several systematic reviews published in 2021 found that regular and moderate coffee consumption is associated with a lower risk of some chronic liver diseases. However, experts clearly state that this does not mean coffee is a treatment for liver disease.
People with existing liver conditions should consume caffeine only as per their doctor’s advice.