1. Coffee contains certain nutrients. The niacin in coffee contains vitamin B, and roasted coffee beans have a higher content;

2. Bitter coffee is good for the skin. Coffee can promote metabolic function, activate digestive organs, and has a great effect on constipation;

3. Coffee has the function of relieving hangover. Rapidly oxidize acetaldehyde converted from alcohol, decompose into water and carbon dioxide and be excreted from the body;

4. Bitter coffee can eliminate fatigue;

5. Three cups of bitter coffee a day Coffee can prevent gallstones. Caffeinated coffee can stimulate the contraction of the gallbladder and reduce the cholesterol in the bile that easily forms gallstones;

6. Regular drinking of bitter coffee can prevent radiation damage;

7. The health and medical functions of bitter coffee. Coffee has the functions of antioxidant and heart protection, strengthening muscles and bones, benefiting the waist and knees, stimulating appetite and promoting food intake, eliminating cellulite and accumulation, promoting orifices and dehumidification, activating blood circulation and removing blood stasis, calming wind and relieving spasm.

8. The influence of bitter coffee on emotions.