DIET & NUTRITION 
PATIENT EDUCATION 
OBESITY/WEIGHT MANAGEMENT 
EXERCISE/TRAINING 
LEGAL MATTERS 
GUIDELINES/RECOMMENDATIONS A review of 15 studies across 10 countries and 4,200+ participants aged 45+ finds gut microbiome modulation may slow cognitive decline. Probiotics, dietary changes, and fecal microbiota transplants all show promise through reduced neuroinflammation and altered neurotransmitter signaling.
Clinical Considerations
- Dietary interventions — Mediterranean diet, omega-3s, methyl donors like B12 and folate — reduce neuroinflammation and remodel gut microbiome composition
- Probiotics and synbiotics improve verbal fluency, working memory, and cognitive flexibility in older adults with early decline
- FMT produced faster microbiome shifts and measurable cognitive improvements in Alzheimer’s patients, though evidence remains preliminary
- Commercial probiotics are selected for safety, not cognitive efficacy; the most effective strains may not be on shelves
Practice Applications
- Recommend 30 different plant varieties weekly to maximize microbiome diversity in cognitively at-risk patients
- Counsel patients to eliminate ultra-processed foods that deplete beneficial gut bacteria
- Add fermented foods (kimchi, sauerkraut) to dietary guidance as accessible natural synbiotics
- Educate patients that commercial probiotic supplements lack current evidence for cognitive benefit
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