Drinking black coffee in the morning has a great laxative effect, because coffee can stimulate gastrointestinal peristalsis, produce a laxative effect and improve constipation. However, drinking coffee in the morning is particularly effective, and drinking coffee at other times is not effective.

Drink a cup of boiled water first in the morning, not coffee on an empty stomach. Coffee contains more caffeine, which can stimulate gastric acid secretion and increase gastric acid concentration. At this point, after a night's rest, my stomach is empty. Hyperacidity can easily damage the gastric mucosa, causing stomach pain, heartburn and even nausea.

Extended data:

After studying 25,000 subjects, Korean researchers found that people who drink 3 to 5 cups of coffee a day (about 200 ml per cup) have a lower risk of cardiovascular disease. A study by the National Cancer Research Center of Japan shows that people who drink 1 cup of coffee every day have a lower risk of death from stroke than those who don't drink coffee.

An academic paper published by a medical professor at Indiana University shows that the death rate of people who insist on drinking coffee is lower than that of ordinary people. Chengmai County, the hometown of longevity in Hainan, is rich in coffee, with an average life expectancy of 77.79 years, which is 6.59 years longer than the national average. All the long-lived old people here have the habit of drinking pure coffee.

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