Let's start with the conclusion: black coffee (with or without sugar) is a healthy drink. Drinking coffee for a long time will not cause organic diseases to body organs and functions, but it may produce some adverse reactions, which vary from person to person.

Tea, coffee and cocoa are called the three major drinks in the world. It has been widely used and consumed all over the world for a long time. Many people worry that drinking too much coffee is harmful to health, but Europe, America and Japan have helped us practice it. Drinking coffee is very healthy. Sure, just drink ten cups a day.

There are indeed many people who will feel weak after drinking coffee, feel their heart beating faster, feel chest tightness and stomach upset. But these are not organic diseases. Organic diseases need to follow evidence-based medicine and have a clear scientific proof of the causal relationship between something and a disease. At present, studies have proved that excessive drinking of coffee (more than six cups a day) will increase the risk of cardiovascular and cerebrovascular diseases by 20%, but the causal relationship between normal drinking of coffee and this disease is not established.

Let's talk about gastrointestinal diseases. Although it has been proved that some compounds, caffeic acid and caffeine in coffee can cause gastrointestinal discomfort, there is no research to support the causal relationship between drinking coffee and gastroenteritis, gastric ulcer and gastrointestinal cancer.