Coffee can refresh people and is indispensable for office workers who stay up late and work overtime.

The reason why coffee is not bitter is:

1, too much sugar, many people add a lot of sugar because coffee is bitter, which makes the bitterness of coffee hard to feel; 2. Adding too many milk partners will also increase the sweetness of coffee and cover up the bitterness of most coffee;

3, add a small amount of salt, adding salt does not mean that coffee is really not bitter, but because the tongue is sensitive to ups and downs in different positions, it is difficult for taste buds to feel bitter because of salt.