Many people drink coffee in the morning on an empty stomach, which may be harmful to health, as the bitterness of the coffee increases the rate of production of hydrochloric acid or known as stomach acid, and is responsible for dissolving food, and thus increases the symptoms of bowel disorders and irritable bowel syndrome.
Coffee also increases the stress hormone cortisol level, which has an important role in regulating metabolism.
Also, some studies have found that coffee may lead to a higher incidence of osteoporosis.
Source: Sky News Arabia