Suspected SIBO, bloating and fermentation
Stomach bloating after meals, fermentation or painful bloating soon after eating may raise suspicion of small intestinal bacterial overgrowth, or SIBO, but cannot diagnose it. Nutritional support aims to improve comfort while keeping food varied.
Gabriela Ferent — Qualified dietitian · Affiliated with the CNS

Diagnosis and treatment with your doctor
Targeted reductions, then reintroduction
SIBO requires medical diagnosis
Your doctor checks other causes of bloating and may arrange a hydrogen and methane breath test. These tests have limitations and need clinical interpretation; symptoms alone do not justify treatment.
Spacing meals without under-eating
Between meals, the migrating motor complex helps clear the small intestine. Reducing continuous grazing can be discussed, without imposed fasting or claims to treat SIBO. Timing respects your needs, treatment and tolerance.

Fermentation: temporary adjustments
Targeted reduction of some fermentable carbohydrates may ease symptoms for a limited period. It accompanies medical treatment when indicated but cannot by itself eradicate bacterial overgrowth.
Reintroducing and reviewing
Foods are gradually reintroduced according to tolerance to avoid long-term restriction. Unintentional weight loss, anaemia or persistent symptoms call for medical review rather than further exclusions.
Steps for navigating SIBO
Medical diagnosis
The doctor rules out other causes and may arrange a breath test, interpreted carefully.
Spacing meals
Reducing grazing can be discussed, without imposed fasting or promises of cure.
Temporary adjustment
A targeted reduction in fermentable carbohydrates supports, but does not replace, medical treatment.
Gradual reintroduction
Foods return according to tolerance to avoid long-term restriction.
Reassessment if needed
Weight loss, anaemia or persistent symptoms call for renewed medical review.
Fermentation symptoms need assessment
Digestive symptoms after meals are real, but identifying their cause needs careful medical evaluation.
- Bloating, gas and altered stools make food choices harder.
- These signs may also suggest irritable bowel syndrome or lactose malabsorption.
- Timing, severity or a reaction to bread cannot identify SIBO alone.
- Bring existing medical reports and results rather than repeating tests yourself.
- Weight loss, persistent diarrhoea or marked fatigue need medical reassessment.
What happens in the small intestine
Understanding what happens in the small intestine helps clarify the role of diet.
- Excess bacteria in the small intestine can alter digestion and promote fermentation.
- Nutrient absorption may also be affected in some circumstances.
- Underlying causes, such as motility problems, require medical evaluation.
- Reducing fermentable foods may change symptoms without resolving the bacterial problem.
- An "anti-SIBO" diet replaces neither diagnosis nor medical treatment.
Keeping meals nutritionally adequate
In Luxembourg-Ville, Ettelbruck or Insenborn, support aims for adequate meals rather than growing restriction.
- Assessment reviews tolerated portions, prior exclusions and whether intake is sufficient.
- Adjustment targets carbohydrate amount or distribution, not removing fruit, dairy or starches.
- A low-FODMAP trial, if used, stays temporary and is followed by reintroduction.
- Follow-up aims to broaden meals and protect energy and protein intake.
- Any worsening despite adjustments is reported to the doctor.
Reintroducing foods is planned around your tolerance.
- Plan a repeatable breakfast and lunch before changing evening meals
- Keep tolerated starches and proteins, and check whether changing one portion changes symptoms
- A clearer basis than alternating restrictive plans found online
- Persistent symptoms still need medical follow-up; returning gas does not automatically mean relapse
What belongs to your physician
Diagnosis, tests and medical treatment remain your doctor's responsibility. Dietetic support adapts to them and, with your agreement, a report is sent to your doctor.
Frequently asked questions
No. Several conditions cause similar symptoms; your doctor establishes the diagnosis.
No. Diet mainly supports comfort and nutritional adequacy alongside medical care.
Not indefinitely by default. Any restrictive phase is short and followed by individualised reintroductions.
Ready to start your care pathway?
Book an appointment with Gabriela Ferent — three practices in Luxembourg, consultations with possible CNS coverage on prescription, or privately.
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