DO NOT DRINK COFFEE ON AN EMPTY STOMACH

You should never drink coffee on an empty stomach, neither in the morning nor during the day when you feel hungry and replace your lunch with a cup of coffee to temporarily fill you up and regain your energy.
Experts explain that when coffee is drunk on an empty stomach, the amount of stomach acid increases in the body, which causes heartburn and indigestion that can last throughout the day. High levels of acidity can eventually lead to more serious abdominal problems, such as stomach ulcers, irritable bowel syndrome and reflux. Cheaper coffee, that is, the one of lower quality, usually has higher acidity, which can further increase the harmfulness.
Drinking large amounts of coffee can also increase feelings of anxiety and stress, and when you drink coffee on an empty stomach that problem is even worse. On the other hand, food and digestion can have a calming effect on the body. To reduce the negative effect of coffee on the nervous system, always eat something with coffee. The main reason coffee increases the feeling of stress is the hormonal imbalance caused by caffeine. Morning coffee on an empty stomach can interfere with the production of serotonin, the neurotransmitter responsible for feelings of happiness and well-being. Research has shown that when we stop drinking coffee on an empty stomach, a better mood returns.