What is the harm of drinking too much coffee?

The main active substance in coffee is caffeine. After a cup of coffee, caffeine will be quickly absorbed by the gastrointestinal tract into the bloodstream, and then reach all parts of the body, allowing the substances responsible for nerve excitement to be released. In the next few hours, our body will undergo a series of changes.

Because coffee can cause various effects on the body, the discussion about whether coffee is harmful to health has been going on for hundreds of years. Fortunately, with the advancement of medical science, many discussions have answers. Here are a list of them. Look.

Coffee and cardiovascular disease

Because the caffeine in coffee will speed up the heart rate, strengthen myocardial contraction, and raise blood pressure. There are also active substances such as diterpenoids in coffee, which may increase blood cholesterol levels. Therefore, many people worry that long-term coffee consumption will increase the prevalence of cardiovascular diseases.

In fact, as early as the 1970s and 1980s, there were many papers demonstrating that long-term large amounts of coffee can increase the risk of myocardial infarction, induce premature beats or arrhythmia.

However, the researchers later found that these studies did not consider the influence of life factors. Because people who drink a lot of coffee for a long time are often office workers who are tired from work, sit in the office for a long time, have irregular work and rest, eat unhealthy diet and exercise less, and are addicted to tobacco and alcohol.

Therefore, the high incidence of cardiovascular disease may have nothing to do with drinking more coffee....

After entering the new century, scientists have done relevant research again, and after excluding the influence of age, gender and life factors, they found that:

Drinking coffee normally will not increase the incidence of cardiovascular disease, but will reduce the risk of cardiovascular disease.

Coffee and gastrointestinal diseases

Because coffee will increase the secretion of gastric acid, relax the esophageal sphincter and aggravate the occurrence of acid reflux, and promote the peristalsis of the small intestine. So some people think that coffee will increase the probability of gastric ulcers, and sometimes there is a saying that "drinking coffee on an empty stomach hurts the stomach".

But in 2013, in a study involving 8013 healthy people, whether coffee drinking is related to peptic ulcer, the result was.

The occurrence of gastric ulcer or duodenal ulcer has nothing to do with whether you drink coffee, but is mainly related to whether you have Helicobacter pylori infection or whether you smoke or not.

In other words, to prevent the occurrence of ulcers, sterilization (Helicobacter pylori) and smoking cessation are only useful. They have nothing to do with coffee.

Similarly, this study also studied the relationship between coffee, gastroesophageal reflux disease and peptic ulcer, and also believed that coffee does not cause gastroesophageal reflux disease and has nothing to do with the occurrence of peptic ulcer.

But don't be too happy too early.

Although healthy people drink coffee will not cause ulcers, but for gastrointestinal diseases such as gastric ulcer, duodenal ulcer, inflammatory bowel disease, irritable bowel syndrome, gastrointestinal surgery recovery period, etc. For patients, there is indeed evidence that coffee may aggravate their ulcers or delay their healing.

Coffee and cancer

We have talked about cardiovascular and gastrointestinal diseases. How can we not talk about cancer? After all, a diet is not linked to cancer in a circle of friends. It must be a non-mainstream diet.

The rumors about coffee-induced cancer are mainly focused on breast cancer. It is rumored that drinking coffee for a long time will increase the risk of breast cancer.

However, whether it was the study on eating habits and breast cancer incidence in Beijing Obstetrics and Gynecology Hospital of Capital Medical University in 2008, or the authoritative magazine "Breast Cancer" published in 2015, it gathered 10 European coffees including Germany, Britain, Switzerland, and Spain. 23 research centers in major consumer countries with a total of more than 300,000 people, after 20 years of data statistics, all have unanimously proved:

Whether the coffee drink contains caffeine or not, it has no direct relationship with the risk of breast cancer.

For female friends, the question of whether they can drink coffee during lactation may be more worthy of attention.

Many coffee-drinking mothers worry that if they drink coffee during lactation, caffeine will be transmitted to their babies through breast milk, so they have to quit coffee very hard.

According to existing research, 2 to 3 cups of coffee per day (caffeine less than 300 mg/day) is safe for mothers and babies. Milk has its own protective barrier, and very little caffeine actually enters the milk. Moreover, caffeine is more of an excitatory effect for babies, and it will be fine after metabolism.

Therefore, if you want to drink coffee for an addicted breastfeeding mother, you can choose to drink it between two milk meals, or you can choose decaffeinated or decaffeinated coffee, which will have the least impact on your baby.


The above just said that coffee does not cause cardiovascular disease, gastrointestinal disease, and cancer as reportedly. However, drinking coffee for a long time can still cause some negative effects on the body. for example:

Drinking coffee for a long time will stain your teeth.

Coffee, tea, red wine. Coke, these famous colored beverages, all contain a substance called tannin, which is dark brown. If it acts on the teeth for a long time, it will penetrate into the teeth and cause the teeth to turn yellow.

Drinking coffee may cause calcium loss.

There are three components in coffee beans that are related to the loss or retention of calcium: potassium, oxalic acid, and caffeine. In theory, these things will cause the body to lose calcium.

Instant coffee contains a lot of sugar.

This point needs no explanation.

Some people are sensitive to caffeine.

It’s the kind of person who doesn’t matter if others drink it, and I’m very healthy, but as long as I drink coffee, I get headaches, palpitations, stomachaches, uncomfortable, uncomfortable and want to be hugged.

So what should we do in the face of these situations? What is the correct posture for drinking coffee? Teach you a few tricks:


The upper limit of daily caffeine intake is 400 mg: a cup of Starbucks large American caffeine content is about 200 mg, a small bag of instant coffee (15 g) caffeine content is about 50 mg. So drinking one or two cups of coffee a day is not a big problem.

You can put milk when drinking coffee: because milk contains casein, it can reduce the penetration of tannin into the teeth, which greatly weakens the staining effect of coffee on the teeth. At the same time, adding milk to coffee can use calcium in milk to make up for the loss of calcium caused by coffee.

People who have gastrointestinal diseases, high blood pressure and caffeine sensitivity should not drink it: coffee will have some effects on the body, and people with related diseases will indeed feel uncomfortable drinking it, so it is better to give up.

For pregnant or breastfeeding women, halve caffeine intake

Teenagers better not to drink

Do not drink while taking the medicine.

Don't drink too hot coffee.

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