Everyone likes sugar to a different degree. Some people don't like sugar in their coffee. They like bitter and plain coffee. Some people like to split it in half and add 5 cents of sugar. They think that the sweetness is just right and will not spoil the taste of coffee. Some people just like to add more sugar, but they don't like the bitterness of coffee. They want to cover up the bitter taste with sugar. Adding some sugar is only for people, and there is no mandatory regulation.
Personally, I like to add 5 points, the sweetness is moderate, and I can taste the delicious coffee. Add 5 cents of sugar to make espresso. Coffee has many functions, such as diuresis, stimulating the central nervous system and respiratory system, dilating blood vessels, speeding up the heartbeat, enhancing the strength of striated muscles, and relieving brain and muscle fatigue.