Constantly bloated? The most common causes and what really helps

Bloating is a common digestive problem caused by excessive gas formation in the intestines. The most common causes include a low-fiber diet, eating too quickly, certain food intolerances, and an unbalanced gut flora. The good news: targeted dietary adjustments, probiotic foods, and sufficient fiber can significantly reduce bloating in most cases.

In this article, you will learn the 8 most common causes of a bloated stomach and get 7 concrete, scientifically based tips to help you improve your digestion in the long term.

The 8 most common causes of bloating

1. Low-fiber diet and unbalanced gut flora

One of the main causes of bloating is a low-fiber diet, which can disrupt the balance of gut flora. If the "good" gut bacteria receive too little nourishment, gas-producing bacteria can spread. Studies show that a high-fiber diet increases the diversity of gut flora and can reduce digestive discomfort.

According to a study by Stanford University, fermented foods significantly increase the diversity of gut flora and reduce inflammation markers. A diverse bacterial composition in the gut ensures more efficient digestion and less gas production.

2. Eating too quickly and swallowing air

If you rush through your meals, you automatically swallow more air (aerophagia). This air accumulates in the digestive tract and can lead to a bloated stomach. Eating slowly and chewing consciously not only reduces air intake but also improves digestion, as food is already partially digested in the mouth.

3. Lactose intolerance and dairy products

About 15 to 20 percent of the German population suffer from lactose intolerance – many without knowing it. If the body cannot properly break down milk sugar (lactose), it passes undigested into the large intestine, where bacteria ferment it and produce gases. The result is bloating, a feeling of fullness, and sometimes diarrhea.

4. Excessive consumption of hard-to-digest foods

Certain foods are known to cause bloating: legumes (beans, lentils), cruciferous vegetables (broccoli, cauliflower, white cabbage), onions, and garlic. They contain complex carbohydrates and sugar alcohols that are not fully digested in the small intestine and cause gas formation in the large intestine. This does not mean you should avoid these healthy foods—but a gradual introduction gives your gut time to adjust.

5. Dysbiosis: imbalance of gut flora

Dysbiosis refers to an imbalance of gut bacteria where harmful bacteria dominate. Common triggers are antibiotics, chronic stress, alcohol, or a one-sided diet. In dysbiosis, certain bacterial strains produce increased gases, leading to chronic bloating. Building a healthy gut flora through probiotic and prebiotic foods is crucial here.

6. Irritable bowel syndrome (IBS)

Irritable bowel syndrome affects about 10 to 15 percent of the population and manifests as recurring abdominal pain, bloating, and altered bowel habits. The exact causes are not fully understood, but a disturbed gut-brain axis, stress, and altered gut motility play a role. If you suspect IBS, you should seek medical advice.

7. Medications and GLP-1 agonists

Certain medications can cause bloating as a side effect. Especially GLP-1 receptor agonists (such as semaglutide or liraglutide), used for weight loss, slow gastric emptying and can lead to constipation and bloating. A study shows that up to 30 percent of users experience gastrointestinal side effects like bloating and constipation. A fiber-rich diet and sufficient fluids can help here.

8. Chronic stress and the gut-brain axis

Stress directly affects your digestion. The gut-brain axis connects the central nervous system with the digestive system. Chronic stress changes gut motility, can make the gut barrier more permeable, and disrupts the gut flora balance. This can lead to bloating, abdominal pain, and other digestive issues.

7 concrete tips: What you can do against bloating

1. Gradually increase fiber intake

Fiber is essential for healthy digestion and nourishes the "good" gut bacteria. The German Nutrition Society (DGE) recommends at least 30 grams of fiber per day. However, increase your intake gradually to give your gut time to adjust.

Good sources of fiber are:

• Whole grain products (oatmeal, whole grain bread, brown rice)
• Vegetables (especially carrots, sweet potatoes, zucchini)
• Fruits (berries, apples with skin, pears)
• Legumes (well soaked and thoroughly cooked)
• Seeds and nuts (flaxseeds, chia seeds, almonds)

Your daily greens – fiber, vitamins, and minerals, without a grassy taste.

2. Incorporate fermented foods into your diet

Fermented foods contain live microorganisms that can positively influence your gut flora. The Stanford study by Wastyk et al. (2021) showed that a diet rich in fermented foods increases gut flora diversity and reduces inflammation markers.

Recommended fermented foods:

• Sauerkraut (unpasteurized)
• Kimchi
• Natural yogurt with live cultures
• Kefir
• Kombucha
• Miso

Start with small portions (1 to 2 tablespoons daily) and gradually increase the amount to avoid overloading your gut.

3. Drink enough water – at least 2 liters daily

Water is essential for healthy digestion. It helps fiber swell and move through the gut. With too little fluid, fiber can paradoxically worsen constipation and bloating instead of relieving it.

What to watch for:

• At least 30 to 35 ml per kilogram of body weight
• More water with a high-fiber diet
• Drink throughout the day, not all at once
• Additional fluids during physical activity

4. Eat slowly and chew thoroughly

Mindful eating is one of the simplest and most effective ways to reduce bloating. If you chew each bite 20 to 30 times, you significantly relieve your digestive system. Digestion already begins in the mouth through enzymes in saliva.

Practical tips:

• Put down cutlery between bites
• Eat without distractions (no phone, TV, or computer)
• Plan at least 20 minutes per meal
• Don’t talk with your mouth full (extra air!)

5. Identify and avoid individual trigger foods

Every body reacts differently to certain foods. A food diary helps you identify your personal triggers. Record over 2 to 3 weeks:

• What you ate (with time)
• When bloating occurred
• Accompanying symptoms
• Stress level and sleep quality

Common triggers are: dairy products, wheat or gluten, artificial sweeteners (sorbitol, xylitol), carbonated drinks, alcohol, and very fatty foods.

6. Move regularly – even light activity helps

Physical activity promotes gut motility and helps move gas faster through the digestive tract. You don’t have to be an athlete – even a 15-minute walk after eating can work wonders.

Recommended activities:

• Daily walks (especially after meals)
• Yoga exercises for digestion (e.g., seated twist, child’s pose)
• Light jogging or cycling
• Swimming

7. Manage stress with proven relaxation techniques

Since the gut-brain axis plays a central role in digestive issues, stress management is essential. Chronic stress can negatively affect your gut flora composition and increase bloating.

Proven techniques:

• Breathing exercises (e.g., 4-7-8 breathing)
• Meditation or mindfulness exercises (10 to 15 minutes daily)
• Progressive muscle relaxation
• Sufficient sleep (7 to 9 hours)
• Time in nature

When should you see a doctor?

Occasional bloating is normal. However, there are warning signs when you should seek medical advice:

• Chronic, persistent bloating over several weeks
• Severe abdominal pain or cramps
• Blood in the stool
• Unexplained weight loss
• Fever
• Severe constipation or diarrhea
• Waking up at night due to discomfort

These symptoms may indicate more serious conditions such as chronic inflammatory bowel diseases, celiac disease, or other gastrointestinal problems that require professional diagnosis.

The role of dietary supplements in bloating

A balanced diet forms the foundation. However, certain dietary supplements can provide support – especially when it is difficult to get enough fiber and micronutrients through a normal diet.

Fiber powders from natural sources like psyllium husks or inulin can help reach the recommended daily amount. It is important to increase the amount gradually and drink enough water.

Your daily greens – fiber, vitamins, and minerals, without a grassy taste.

Green powders can be a convenient way to get extra fiber, vitamins, and minerals that may contribute to normal digestive function (1). Look for products without unnecessary additives and with high-quality, natural ingredients.

Frequently asked questions about bloating