Digestive problems: real causes, microbiota and what helps
What digestive inflammation really is
When patients come to the pharmacy talking about "inflammation", most mean visible bloating, heaviness, or abdominal distension. As a pharmacist, I know that digestive inflammation is a genuine biological process: your immune system detects a threat and mounts a protective response.
The problem is chronicity. Acute inflammation — like when you cut yourself — is your defence mechanism. But when inflammation becomes chronic, low-grade and persistent, that is when the destructive cycle begins: it inflames the intestinal walls, disrupts nutrient absorption, and keeps the immune system in a state of constant activation without good reason.
Acute vs chronic inflammation
Acute inflammation resolves in days. Chronic inflammation is silent: you cannot see it, but it is there. In practice I find that the symptoms are remarkably similar between mild dysbiosis and a diagnosed condition — bloating, gas, abdominal pain, changes in bowel habits. The critical difference is that dysbiosis is reversible.
A 2022 meta-analysis in Front Immunol found that chronic systemic inflammation may propagate to the brain via the bloodstream, contributing to fatigue, brain fog, anxiety, and depression. This is the gut-brain crosstalk in action.
The real causes I see in practice
In my experience, the most common causes are: dysbiosis (bacterial imbalance), increased intestinal permeability ("leaky gut"), ultra-processed dietary patterns, chronic stress, prior antibiotic use, and a sedentary lifestyle. The key insight is this: one cause generates inflammation, inflammation damages the intestinal barrier, a damaged barrier allows things through that shouldn't pass, and that triggers more inflammation. It is a self-perpetuating cycle.
How your gut microbiota works
Your microbiota is not a detail — it functions practically as an organ. You have more bacterial cells in your gut than human cells in your entire body. And they are not there by accident: we co-evolved over millions of years.
The microbiota is a community of more than 100 trillion microorganisms. They live primarily in the colon and part of the small intestine, with vital roles in protection, nutrition, and communication with the body. Without this community, survival would not be possible.
The three key functions of your microbiota
Protection: Beneficial bacteria compete for space and nutrients, preventing pathogens from proliferating. They produce antimicrobial substances that inhibit harmful bacteria, and they reinforce the intestinal barrier by producing protective mucus.
Nutrition: Your microbiota synthesises vitamins you cannot produce on your own: B12, K, folate. It ferments fibre into short-chain fatty acids (butyrate, propionate, acetate) — the primary fuel for intestinal cells. Without this fermentation, your intestinal cells are effectively starved.
Communication: Bacteria send signals that influence your immune and nervous systems. Around 90% of the serotonin in your body — the neurotransmitter associated with wellbeing — is produced in the gut, with the help of your microbiota. The communication is bidirectional: your mood affects your flora, and your flora affects your mood.
The most important beneficial bacteria
| Bacterium | Primary function | Key benefit |
|---|---|---|
| Lactobacillus plantarum | Fermentation and intestinal barrier | May reduce inflammation, improve transit, produces antimicrobial bacteriocins |
| Lactobacillus rhamnosus | Mucosal adhesion | May block pathogens, reinforce intestinal junctions, reduce bloating |
| Bifidobacterium longum | SCFA production | Fuels intestinal cells, strong anti-inflammatory effect |
| Lactobacillus acidophilus | B-vitamin synthesis | May improve absorption, support energy levels, reduce fatigue |
When these bacteria are present in adequate numbers, your gut functions smoothly. When they diminish, the disruption characteristic of dysbiosis begins.
Short-chain fatty acids (SCFAs): the missing fuel
SCFAs are produced when your microbiota ferments dietary fibre. The main ones are butyrate, propionate, and acetate. Butyrate is the preferred energy source of your colonocytes — the cells lining the colon. Without sufficient butyrate, those cells deteriorate, the intestinal barrier weakens, and increased intestinal permeability follows.
A 2020 study in Benef Microbes found that SCFAs have systemic anti-inflammatory effects, reducing inflammation throughout the body, not only in the gut. Butyrate in particular is a key molecule in metabolic health.
Dysbiosis and the gut-brain axis
Dysbiosis is the clinical term for an imbalanced microbiota. It is not a diagnosable disease in itself, but it underlies most of the chronic digestive problems I see in the pharmacy. In dysbiosis, several things may occur: harmful bacteria dominate, beneficial bacteria disappear, specific important strains are lost, or bacterial diversity drops considerably.
How dysbiosis develops
Antibiotics: The classic culprit. A course of antibiotics indiscriminately eliminates all bacteria, including beneficial ones. Most recover, but some strains may never return. I have seen patients with persistent digestive problems years after a single antibiotic course.
Modern ultra-processed diet: The ideal environment for pro-inflammatory bacteria. The absence of fibre is particularly critical: around 80% of people consume less than half the fibre they need. Without fibre, the beneficial bacteria that ferment it disappear through lack of substrate.
Chronic stress: This is not metaphorical. Stress elevates cortisol, which alters intestinal tight junctions, changes the pH of the colon, and favours pathogenic bacteria such as Clostridium. The relationship is bidirectional: stress damages the microbiota, and a damaged microbiota worsens the ability to manage stress.
Poor sleep and sedentary behaviour: Bacteria have circadian rhythms. Disrupted sleep desynchronises the entire microbial community. Physical movement stimulates peristalsis; sedentary behaviour slows everything down and favours pathogenic proliferation.
The gut-brain axis: the connection that changes everything
Your gut and your brain are not independent organs. They are connected bidirectionally through the vagus nerve, the immune system, and chemical substances produced by your microbiota. When the microbiota is balanced, it produces neurotransmitters including serotonin and GABA. When it is dysbiotic, it produces less of these beneficial compounds and more toxins such as LPS (lipopolysaccharide) — an inflammatory molecule that crosses a permeable gut and activates the immune system without cause.
A 2023 study by Spanish researchers in J Integr Neurosci demonstrated a direct connection between dysbiosis, neuroinflammation, and depression. It is not that depression causes digestive problems: a damaged microbiota may cause both systemic inflammation and cerebral inflammation, contributing to depression.
Symptoms that suggest dysbiosis
When assessing whether a patient may have dysbiosis, I look for patterns. Chronic bloating after meals, excessive wind, changes in bowel habits, cramping without a clear diagnosis, sensitivity to foods previously well tolerated, fatigue after eating, skin conditions such as eczema or acne, new allergies or intolerances, anxiety or low mood associated with digestive symptoms, recurrent urinary or candida infections, and persistent bad breath. If you recognise more than three of these, dysbiosis is a plausible explanation. The encouraging part is that it is reversible with the right approach.
Is this relevant for you?
While most people with sluggish digestion would benefit from improving their microbiota, there are specific profiles where acting now is particularly important:
If you have recently taken antibiotics
If you have had antibiotic treatment within the past six months, your microbiota is very likely to be disrupted. Broad-spectrum antibiotics are especially damaging. If the course was recent, this is the right moment to begin restoration. Many people never fully recover their bacterial diversity after antibiotics without deliberate intervention.
If you have irritable bowel syndrome (IBS)
IBS is the single most common reason people visit the pharmacy with digestive complaints. In most cases there is underlying dysbiosis. A recent meta-analysis found that probiotics may significantly reduce IBS symptoms when the correct strain is selected.
If you eat very little fibre
If your diet is predominantly processed foods, meat, and fat, your microbiota is undernourished. The beneficial bacteria that ferment fibre disappear because they have no substrate. This is a near-universal problem in modern Western diets.
If you live under chronic stress
Stress is a silent destroyer of the microbiota. If you work under constant pressure, sleep poorly, or experience persistent anxiety, your microbiota suffers. Many people assume their digestive problems are purely physical, when stress may account for a significant portion of the problem.
12-week digestive recovery plan
Here is what genuinely matters: how to restore your microbiota and repair your digestion. It is not complicated, but it requires consistency. What works is a comprehensive approach that addresses the problem from multiple angles: removing inflammatory triggers, introducing restorative foods, selected probiotics, and gradual fibre increase.
Phase 1: Weeks 1–4 — Elimination and repair
Weeks 1–2: Reducing key inflammatory triggers. The first step is to stop feeding the inflammation. Remove ultra-processed foods, refined sugar, alcohol, and excessive caffeine. Eat real food: chicken, fish, eggs, rice, potatoes, cooked vegetables. This is not a restrictive diet — it is being strategic.
Weeks 3–4: Introduce restorative foods. With inflammation reduced, focus on repair. Bone broth provides collagen and amino acids that support the mucosa. Foods rich in glutamine (chicken, eggs, cooked vegetables) are important. Introduce probiotics at this point — but with one important note: not all probiotics work for everyone. The strain matters.
Phase 2: Weeks 5–8 — Rebuilding and diversity
Introduce soluble fibre gradually. Adding large amounts of fibre to a damaged microbiota will worsen bloating and wind. The approach must be gradual: weeks 5–6, one banana per day; week 7, soft cooked vegetables with each meal; week 8, small amounts of brown rice. Continue probiotics throughout.
Add prebiotics strategically. Prebiotics feed beneficial bacteria. Start with very small amounts of inulin and FOS, unripe banana (resistant starch), and cooked onion and garlic. The pattern: modest fibre with probiotics to process it, increasing both gradually.
Phase 3: Weeks 9–12 — Maintenance and sustainability
Establish the maintenance pattern. By month three, your microbiota should be considerably recovered. Continue with a maintenance probiotic four to five days per week. Aim for 25–35 g of fibre daily. Hydration: 2–3 litres of water. Movement: 30 minutes daily, including walking. Sleep: 7–8 hours — this is not optional. These pillars sustain digestive health long term.
Digestive supplements recommended by our pharmacist
Having reviewed the evidence on probiotics and observed what genuinely works with our patients, these are the two products I would recommend without hesitation. Not purely on price, but because the strains are scientifically validated for what they claim to do.
Lactoflora Intestinal Protector Adults 10 Vials
Probiotic containing Lactobacillus rhamnosus and L. plantarum. Formulated to support the intestinal barrier, reduce inflammation, and help restore microbial balance. Particularly useful following antibiotics or during acute digestive stress.
Produo Daily Care 30 Capsules
Precision probiotic for long-term digestive maintenance. Ideal for Phase 3 of the protocol, or when your flora is already restored and you want to maintain balance sustainably.
I have recommended LACTOFLORA for years. The reasons are clear: it contains two strains specifically validated for repairing the intestinal barrier. Lactobacillus rhamnosus is among the most studied strains for antibiotic-associated dysbiosis. Lactobacillus plantarum is well regarded for reducing bloating and improving transit. The vial format preserves viability during transport and ambient-temperature storage better than most capsule formats.
PRODUO Daily Care comes from a serious laboratory. It is what I would keep in my own medicine cabinet as a pharmacist. The two strains are complementary: Lactobacillus plantarum supports barrier reinforcement, and Lactobacillus acidophilus is particularly relevant for B-vitamin synthesis — especially important where fatigue accompanies poor digestion.
For anyone who wants to give this a genuine effort, here is the protocol I would follow: weeks 1–4 LACTOFLORA (one vial daily); weeks 5–8 continue LACTOFLORA alongside dietary changes; weeks 9–12 transition to PRODUO Daily Care for maintenance (four to five days per week).
Questions I am asked consistently
Does bloating always indicate a medical condition? +
Not always. Most people with chronic bloating have dysbiosis, undiagnosed food sensitivities, or chronic stress — all of which are reversible. In my experience, fewer than 5% of patients presenting with digestive symptoms have a serious condition such as Crohn's disease or ulcerative colitis.
Do probiotics reduce bloating? +
Yes, when dysbiosis is the cause. Strains such as Lactobacillus rhamnosus may reduce excessive carbohydrate fermentation (which produces gas) and help restore microbial balance. Results are generally better when combined with dietary changes, but there is little downside to trying.
How long does it take for gut flora to recover? +
Symptoms may improve within 2–3 weeks in mild dysbiosis. Genuine changes in bacterial composition take at least 8–12 weeks. For full recovery after antibiotics, some studies suggest six months or more. That is why the protocol runs for 12 weeks — it is a realistic timeframe for meaningful change.
Does stress really cause digestive problems? +
Yes — and it is one of the most underestimated factors. Chronic cortisol alters intestinal permeability, changes the pH of the colon, slows digestion, and measurably shifts microbial composition. I have seen patients whose digestion improved considerably simply by reducing stress or practising regular mindfulness. This is the gut-brain axis in practice.
What is the difference between probiotics and prebiotics? +
Probiotics are live beneficial bacteria you introduce into the gut. Prebiotics are the substances that feed those bacteria — fibre, inulin, FOS. A useful analogy: probiotics are like bringing workers into your home; prebiotics are what you feed them. The best results come from combining both. Foods high in prebiotics include unripe banana, garlic, onion, asparagus, and legumes.
Which foods should I avoid with digestive problems? +
The most consistently problematic: ultra-processed foods, excessive saturated fat, alcohol, and too much caffeine. In some cases, gluten or casein where sensitivity exists. Individual tolerance varies considerably, and it is worth conducting your own dietary experiment while restoring your flora. Most people notice significant improvement simply by removing ultra-processed foods.
When should I see a GP about digestive problems? +
Seek medical advice if: there is blood in the stool, unexplained weight loss, severe persistent pain, no improvement after two months of a consistent protocol, or significant changes in your bowel pattern. Also if you suspect inflammatory bowel disease or have a diagnosis of IBS that is not responding. It is an important step to rule out serious underlying conditions.
Does L-glutamine help repair the gut? +
Yes, and considerably so. L-glutamine is the preferred fuel of enterocytes — intestinal lining cells. It may help reinforce the intestinal barrier, reduce permeability, and support recovery. If you have increased intestinal permeability or are recovering from significant inflammation, glutamine is a useful tool. It is found in chicken, eggs, and supplement powders. In this protocol, glutamine comes primarily from real foods such as bone broth.
Act today, feel better tomorrow
If you have read this far, your digestive health matters to you. That is the starting point. Chronic digestive problems do not simply resolve on their own — they tend to perpetuate until you intervene. What I want you to understand is that your microbiota is not a peripheral detail: it is central to your health. A compromised microbiota does not only cause bloating — it drives systemic inflammation, affects energy levels, mood, the ability to manage weight, and immune function.
But it is also reversible. Unlike many things in medicine, dysbiosis tends to respond well to the right intervention. I have seen people transform their quality of life in 12 weeks. Not because it is magic, but because they finally addressed the actual problem rather than managing symptoms.
Your concrete action plan
Today: 1) Assess where you are. How many dysbiosis symptoms do you recognise? 2) Consider LACTOFLORA or PRODUO — at €13–18, the question worth asking is: what is your digestive health worth? 3) Clear ultra-processed foods from your kitchen. 4) Add 30 minutes of walking daily. 5) Aim for 7–8 hours of sleep. 6) Review in four weeks: less bloating? Better energy? That confirms you are on the right track. If there is no change, something else may be at play and a GP review is advisable.
What I do not want is for you to read this, feel motivated, and do nothing. That is the pattern I see most often, and it is frustrating — because I know that if people acted, most would feel meaningfully better. Your body has a remarkable capacity for recovery, but it requires the right conditions and consistency. That is what this article has set out to give you.
Cuadro resumen: Problemas digestivos
| Bacteria | Función principal | Beneficio clave |
|---|---|---|
| Lactobacillus plantarum | Fermentación y barrera intestinal | Reduce inflamación, mejora tránsito, produce bacteriocinas antimicrobianas |
| Lactobacillus rhamnosus | Adherencia a mucosa | Bloquea patógenos, refuerza uniones intestinales, reduce hinchazón |
| Bifidobacterium longum | SCFA production | Alimenta células intestinales, fuerte efecto anti-inflamatorio |
| Lactobacillus acidophilus | Síntesis de vitaminas B | Mejora absorción, aumenta energía, reduce fatiga |
Preguntas frecuentes
