For many people, the day doesn’t start without a steaming cup of coffee. However, the habit of drinking coffee immediately after waking up, without having eaten anything, can have more serious consequences than previously thought. While the energy provided by caffeine seems like a quick solution, the reality is that consuming it on an empty stomach can disrupt digestive, hormonal, and even mental balance.
What Happens in the Body When We Drink Coffee on an Empty Stomach
- Increased Acidity
Coffee stimulates the production of hydrochloric acid in the stomach. In the absence of food, this acid can attack the gastric mucosa, causing inflammation and increasing the risk of gastritis or gastric ulcers. - Increased Cortisol
In the morning, cortisol levels (the stress hormone) are already high. Consuming coffee on an empty stomach further increases it, which can lead to anxiety, irritability, and even hormonal imbalances over time. - Disruption of Gut Flora
Recent studies indicate that drinking coffee on an empty stomach can affect the balance of the intestinal microbiome, promoting dysbiosis and long-term digestive issues. - Decreased Absorption of Certain Nutrients
Coffee inhibits the absorption of iron and other essential minerals, especially when consumed without food to buffer the effects of caffeine.
What Studies Say
- A study published in Alimentary Pharmacology & Therapeutics showed that patients who consume coffee without food have a higher risk of gastric irritation and gastroesophageal reflux.
- Researchers from the University of Bath (UK) demonstrated in 2020 that a single cup of coffee consumed in the morning, without food, can disrupt insulin sensitivity even in healthy individuals.
- Other studies, such as one in the Journal of Clinical Gastroenterology, highlighted the harmful effects of caffeine on the gastric mucosa in the absence of food.
Doctors’ Warnings
Dr. Alina Cuc, a gastroenterologist, stated in an interview:
Drinking coffee on an empty stomach is an aggression to the digestive system. Over time, this habit leads to inflammation, burning sensations, and even ulcers. I recommend consuming it only after the patient has had a light breakfast.
Similarly, Dr. Ruxandra Pleea, a nutrition specialist, mentions that:
Drinking coffee without food can affect the brain-gut axis, causing agitation, nervousness, and metabolic imbalance.
Specific Contraindications
Drinking coffee on an empty stomach is particularly dangerous for:
- Individuals with gastritis, gastric ulcers, or reflux;
- Women with severe premenstrual syndrome (due to hormonal fluctuations);
- Those with anxiety or sleep disorders;
- Diabetics or prediabetics, due to its influence on blood sugar levels;
- Anemic individuals (as coffee reduces iron absorption).
What You Can Do Instead
- Drink coffee 30-60 minutes after breakfast;
- Avoid drinking it on an empty stomach, even in decaffeinated form;
- Choose light foods beforehand (bananas, yogurt, whole grain bread);
- Hydrate with water before coffee to help reduce acidity.
Sources:
- Alimentary Pharmacology & Therapeutics – Effects of coffee on gastric acid secretion
- Journal of Clinical Gastroenterology – Caffeine and the stomach: what we know
- University of Bath – Morning coffee and its impact on glucose metabolism
- Health Today – Interview with Dr. Alina Cuc
