1, bitter. Black coffee is coffee without sugar or milk. Compared with other coffees, it tastes bitter. It is an imported drink, a fashion at present, favored and sought after by young people, and also a necessary drink for family leisure and communication. Black coffee contains water, protein, fat, sugar, cellulose, ash, calcium, phosphorus, iron, sodium, vitamin B2, nicotinic acid, caffeine, tannin and other substances.

2. Nutritional value:

(1) Refreshing: Black coffee contains a lot of caffeine and has a strong bitter taste, which can stimulate the nerves, heart and respiratory system. Therefore, moderate consumption of black coffee can refresh the mind and slow down the fatigue of the brain and muscles. Because caffeine has a strong diuretic effect, it can promote the elimination of excess sodium ions in the kidney blood and is also good for the cardiovascular system.

(2) Happy mood: Nowadays, many young people regard black coffee as a fashionable leisure drink. Drinking a cup of fragrant black coffee after busy work is not only a means to eliminate fatigue, but also a kind of spiritual enjoyment, which can relieve the physical and mental fatigue of the day and adjust the mood and mood. Experiments show that the average person absorbs 300 mg (about 3 cups of brewed coffee) every day, which will have a good influence on a person's alertness and mood.

(3) Appetizing food: Caffeine in black coffee can stimulate sympathetic nerve, stimulate gastrointestinal secretion of gastric acid, promote digestion, prevent abdominal distension and gastroptosis, and promote gastrointestinal hormones and peristalsis hormones, thus quickly relieving constipation.