According to your description, you want to lose weight. Drinking coffee plays an exciting role and promotes the burning of calories, which can help you lose weight to some extent. However, this effect will not take effect in a short time, and coffee will lead to increased heart rate and excessive gastric acid secretion, so people with peptic ulcer, gastritis, arrhythmia and other diseases just don't drink coffee. The rest, as long as they drink coffee properly every day, should not have any harmful side effects.