真的建议，这8类人少喝咖啡！I really suggest that these 8 types of people drink less coffee!

目前，有很多研究提到常喝咖啡对健康有益，比如能提神醒脑、缓解疲劳、预防2型糖尿病、预防某些癌症等。不过咖啡也并非适合所有人，有8类人不能盲目喝咖啡，一定要特别注意。

示意图，AI辅助生成

资料图， 新华社记者 金马梦妮 摄

For modern people, coffee has gradually become a popular beverage and a daily essential "life-saving tool" for many office workers.

At present, many studies mention that regular coffee drinking is beneficial to health, such as refreshing, relieving fatigue, preventing type 2 diabetes, and preventing some cancers. However, coffee is not suitable for everyone. There are 8 types of people who should not blindly drink coffee and must pay special attention.

Coffee information picture, taken by Xinhua News Agency reporter Liu Lei

01

Population with arrhythmia

Although an increase in heart rate after drinking coffee is a normal phenomenon, it still needs to be taken seriously, especially for people who already have arrhythmia.

Arrhythmia is mainly caused by abnormal electrical conduction of the heart, resulting in irregular, too fast or too slow heartbeat. More than 80% of American doctors recommend patients with palpitations or arrhythmias to quit or reduce their intake of caffeine.

In addition, some studies have shown that for most people, a daily intake of less than 400 milligrams of caffeine seems safe and may even have a protective effect on arrhythmia; However, for individuals with malignant arrhythmias and high-risk individuals with caffeine sensitive arrhythmias, it is still advisable to avoid caffeine intake as much as possible.

400 milligrams of caffeine is equivalent to no more than 4 cups of pure coffee (150 milliliters per cup). If it is purchased coffee, the number of cups can be calculated by comparing the caffeine content per cup on the packaging label; If it is a small packet of 1.8-2 grams of instant coffee, generally no more than 5 bags per day.

02

People who have poor sleep

Coffee contains a high amount of caffeine, which has a certain refreshing effect. Therefore, many office workers rely on coffee to stay alert and work hard.

Studies have shown that caffeine is rapidly absorbed by the human body, typically reaching its peak within 15 minutes to 2 hours after consumption, spreading throughout the body, and crossing the blood-brain barrier. The half-life in the adult body is generally 2.5-4.5 hours. So, in general, drinking coffee 5 hours before planning to sleep will not have a significant impact on a normal person's sleep. For example, if you go to bed at 10 pm, drink coffee before 5 pm in the afternoon.

However, different populations have varying levels of tolerance to caffeine. People who already have poor sleep, insomnia, and sleep disorders should try to drink less or avoid coffee as much as possible.

03

Patients with Irritable Bowel Syndrome

Irritable bowel syndrome is a common functional bowel disease, and patients may experience frequent diarrhea and constipation.

Caffeine can stimulate the secretion of gastric acid and cholecystokinin in the digestive system, thereby promoting colon motility and causing symptoms such as diarrhea. In general, patients with irritable bowel syndrome are more sensitive to caffeine, and drinking it may increase symptoms of gastrointestinal discomfort and diarrhea. Reducing caffeine intake can lower the incidence of symptoms related to irritable bowel syndrome.

04

People with stomach diseases

Coffee can stimulate the gastrointestinal tract and increase the secretion of stomach acid. For people with normal stomach function, this will not affect their health. But for people who already have stomach problems, such as gastric ulcers, excessive gastric acid secretion, and gastroesophageal reflux disease, frequent or excessive consumption of coffee may lead to symptoms such as nausea, vomiting, acid reflux, and heartburn.

Schematic diagram, AI assisted generation

05

Osteoporosis population

The caffeine, tannic acid and other components in coffee can indeed affect calcium absorption, and caffeine diuresis can increase calcium loss, but this has little effect on healthy people. A study suggests that caffeine has minimal negative effects on calcium absorption, which can be completely offset with just 1-2 tablespoons of milk.

Based on a large amount of population data, food safety regulatory agencies such as the European Food Safety Agency, the US Food and Drug Administration, Health Canada, and the Australian and New Zealand Food Standards Agency believe that a daily intake of caffeine within 400 milligrams for healthy adults will not have adverse effects on cardiovascular function, behavior, reproduction and development, bone health, and there is no risk of acute poisoning. So, healthy people don't have to worry about drinking coffee causing osteoporosis.

However, for individuals who already suffer from osteoporosis, the "Chinese Expert Consensus on the Diagnosis, Treatment, and Management of Osteoporotic Pain in the Elderly (2024 Edition)" recommends avoiding excessive consumption of coffee.

Data picture, taken by Xinhua News Agency reporter Jin Mamoni

06

Pregnant and lactating women

According to the Scientific Consensus on Coffee and Health, it is not recommended for pregnant women to drink coffee, and if consumed, no more than 2 cups per day. Although institutions such as Health Canada, the American College of Obstetricians and Gynecologists, and the American Maternity Association believe that coffee should be consumed in small amounts during pregnancy (no more than 150-300mg of caffeine per day, about 2 cups), pregnant women should not be encouraged to drink coffee.

Therefore, for women who do not have the habit of drinking coffee regularly, it is recommended not to drink coffee during pregnancy and lactation; For women who have a habit of drinking coffee regularly, it is best to limit their coffee consumption.

07

Children and adolescents

The currently recommended safe intake of caffeine for children and adolescents internationally is no more than 2.5-3 milligrams per kilogram of body weight. For example, for children and adolescents weighing 40 kilograms, the intake of caffeine is 100-120 milligrams, which is about one cup of coffee, but it is best not to drink it.

This is because children who are in the growth and development stage have weaker ability to metabolize caffeine than adults, which not only affects sleep but also physical development.

The "Chinese Children and Adolescents Snack Guide (2018)" also mentions that foods containing caffeine can have negative effects on children's brain development and function. Therefore, children aged 12 and under are prohibited from consuming caffeine and do not drink caffeinated beverages such as strong tea and coffee.

08

Glaucoma patients

Studies have shown that caffeine in coffee can cause abnormal increase in intraocular pressure in glaucoma patients, which is a risk factor for the development of glaucoma. Elevated intraocular pressure can cause damage to the optic nerve and visual function, and in severe cases, can lead to blindness.

Therefore, glaucoma patients should avoid drinking high caffeine beverages such as coffee in their daily lives to prevent further damage to the eyes caused by increased and fluctuating intraocular pressure.

Source: CCTV News WeChat official account, Popular Science China, Xinhua News Agency

Guangzhou Daily Xinhua City Editor: Wang Yuanyuan