04/01/2026
❇️ PROBIOTICS vs PREBIOTICS
Basic Concept
Probiotics → Live microorganisms that may provide health benefits when taken in adequate amounts
Prebiotics → Non-digestible food components that selectively stimulate the growth or activity of beneficial gut bacteria
PROBIOTICS
→ Live microorganisms (commonly Lactobacillus, Bifidobacterium, Saccharomyces boulardii)
→ Benefit is strain-specific and condition-specific
Mechanisms of Action
→ Temporary modulation of gut microbiota
→ Competitive inhibition of pathogenic bacteria
→ Enhancement of intestinal barrier function
→ Modulation of immune responses
→ Production of antimicrobial substances
(Most probiotics do not permanently colonize the gut)
Common Sources
→ Yogurt/curd with live cultures
→ Kefir
→ Fermented foods (kimchi, sauerkraut, miso)
→ Probiotic supplements
Clinical Uses (Evidence-Based)
→ Antibiotic-associated diarrhea
→ Prevention of Clostridioides difficile–associated diarrhea (selected strains)
→ Infantile colic (some strains)
→ Irritable bowel syndrome (symptom relief in some patients)
→ Acute infectious diarrhea (adjunctive)
Limitations & Safety
→ Effects vary by strain, dose, formulation
→ Benefits are modest in many conditions
→ Usually safe in healthy individuals
→ Avoid or use cautiously in:
→ Severe immunocompromise
→ Critical illness
→ Patients with central venous catheters
→ Premature infants (strain-dependent risk)
PREBIOTICS
→ Non-digestible carbohydrates that are selectively fermented by beneficial gut bacteria
Common Types
→ Inulin
→ Fructo-oligosaccharides (FOS)
→ Galacto-oligosaccharides (GOS)
→ Resistant starch
Mechanisms of Action
→ Promote growth of beneficial microbes
→ Increase short-chain fatty acid (SCFA) production
→ Improve gut barrier function
→ Support metabolic and immune health
Common Sources
→ Garlic
→ Onion
→ Leeks
→ Banana
→ Oats
→ Chicory root
→ Whole grains and legumes
Clinical Benefits
→ Improve stool frequency and consistency
→ Support gut microbiota diversity
→ May improve calcium absorption
→ May aid metabolic health
Limitations
→ Excess intake may cause bloating or gas
→ Effects depend on individual gut microbiota
SYNBIOTICS
→ Combination of probiotics + prebiotics designed to act synergistically
Clinical Role
→ Prebiotics may enhance activity of administered probiotics
→ Used in selected GI conditions
→ Not required for probiotic survival, but may improve efficacy