Constantly bloated? The most common causes and what really helps

Bloating is a common digestive problem caused by excessive gas formation in the intestines. Common causes include a low-fiber diet, rushed eating, certain food intolerances, and an unbalanced gut microbiome. The good news: with targeted dietary adjustments, probiotic foods, and enough fiber, bloating can be significantly reduced in most cases.

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

The 8 most common causes of bloating

1. Low-fiber diet and unbalanced gut microbiome

One of the main causes of bloating is a low-fiber diet, which can disrupt the balance of the gut microbiome. If "good" gut bacteria don't get enough food, gas-producing bacteria can multiply. Studies show that a fiber-rich diet increases gut microbiome diversity and can reduce digestive discomfort.

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

2. Eating too fast and swallowing air

When 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. Slow, conscious chewing not only reduces air intake but also improves digestion, as food is already pre-digested in the mouth.

3. Lactose intolerance and dairy products

Around 15 to 20 percent of the German population suffers 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 lead to gas formation in the large intestine. This doesn't mean you should avoid these healthy foods – but a gradual introduction gives your gut time to adapt.

5. Dysbiosis: Imbalance of the gut microbiome

Dysbiosis refers to an imbalance of gut bacteria, where harmful bacteria dominate. Triggers often include antibiotics, chronic stress, alcohol, or an unbalanced diet. In dysbiosis, certain bacterial strains produce more gases, leading to chronic bloating. Building a healthy gut microbiome 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 recurrent abdominal pain, bloating, and altered bowel habits. The exact causes are not yet fully understood, but a disrupted 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. In particular, GLP-1 receptor agonists (such as semaglutide or liraglutide), used for weight loss, slow down 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, the gut barrier can become more permeable, and the gut microbiome gets out of 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 so your gut has time to adapt.

Good fiber sources include:

• Whole grain products (oatmeal, whole wheat bread, brown rice)
• Vegetables (especially carrots, sweet potatoes, zucchini)
• Fruits (berries, apples with skin, pears)
• Legumes (well-soaked and thoroughly cooked)
• Seeds and nuts (flax seeds, 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 microbiome. The Stanford study by Wastyk et al. (2021) showed that a diet rich in fermented foods increases gut microbiome diversity and lowers inflammatory 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 slowly increase the amount to avoid overwhelming 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 intestines. With too little fluid, fiber can paradoxically worsen constipation and bloating instead of relieving it.

What to look out 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 fluid 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 begins in the mouth with enzymes in saliva.

Practical tips:

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

5. Identify and avoid individual trigger foods

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

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

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

6. Exercise regularly – even light activity helps

Physical activity promotes gut motility and helps move gases more quickly through the digestive tract. You don't have to be a top 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 problems, stress management is essential. Chronic stress can negatively affect the composition of your gut microbiome and worsen bloating.

Proven techniques:

• Breathing exercises (e.g., the 4-7-8 breath)
• 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 for several weeks
• Severe abdominal pain or cramps
• Blood in stool
• Unexplained weight loss
• Fever
• Extreme constipation or diarrhea
• Waking up at night due to discomfort

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

The role of supplements in bloating

A balanced diet forms the foundation. However, certain supplements can be supportive – especially when it's difficult to get enough fiber and micronutrients through a normal diet.

Fiber powder 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 practical way to get additional fiber, vitamins, and minerals that can contribute to normal digestive function (1). Look for products without unnecessary additives and with high-quality, natural ingredients.

Frequently asked questions about bloating