Research & Evidence
Evidence Library
The educational content throughout this app, grounded in research. Each topic carries an evidence grade and a list of the studies and sources behind it — so you can see exactly what the science does and doesn’t yet support.
Evidence Grades
A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
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18 topics
Mind & Nervous System
Epigenetics — Environment Talks to Your Genes
Lifestyle and environment alter gene expression through reversible chemical tags, without changing DNA sequence.
Strong mechanistic and observational evidence; direct causal lifestyle-to-outcome trials are limited.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Mind & Nervous System
Mindfulness Meditation
Structured mindfulness programs reduce anxiety, depression, and stress in clinical and community populations.
Consistent moderate effect sizes across multiple meta-analyses of randomized trials.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Mind & Nervous System
Slow Breathing & Pranayama
Slow, paced breathing increases vagal tone and reduces markers of acute stress.
Growing RCT evidence with consistent physiological effects; trial sizes often small.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Mind & Nervous System
Yoga Nidra (Yogic Sleep)
A guided body-based meditative practice shown to lower stress and support sleep onset.
Limited RCTs and small trials; promising but preliminary.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Movement & Body
Functional Strength Training
Resistance training builds muscle, bone density, and metabolic health — especially important in midlife.
Strong RCT and meta-analytic evidence across age groups.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Movement & Body
Yoga for Menopausal Symptoms
Yoga practice modestly reduces hot flashes, mood symptoms, and sleep disturbance in midlife women.
Multiple RCTs with moderate, consistent benefit; effect sizes modest.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Nutrition & Herbs
Anti-Inflammatory Diet
Mediterranean and whole-food anti-inflammatory eating patterns reduce inflammatory markers and support metabolic health.
Robust RCT evidence (e.g., PREDIMED) for cardiometabolic outcomes; inflammation-specific effects moderate.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Nutrition & Herbs
Phytoestrogens for Hot Flashes
Plant estrogens (isoflavones from soy, flax) may modestly reduce vasomotor symptoms.
Mixed trial results; modest benefit in some studies, not consistently replicated.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Nutrition & Herbs
Ashwagandha (Withania somnifera)
An adaptogenic herb used to reduce stress, anxiety, and cortisol; several RCTs support its effects.
Multiple RCTs show reductions in stress and cortisol; quality and standardization vary.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Sleep & Recovery
CBT for Insomnia (CBT-I)
Cognitive-behavioral therapy for insomnia is the first-line treatment for chronic sleep difficulties.
Robust RCT evidence; recommended as first-line by major guidelines.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Sleep & Recovery
Sauna Use
Regular sauna bathing is linked to reduced cardiovascular mortality and improved recovery.
Strong observational evidence plus small trials; mostly Finnish-cohort based.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Sleep & Recovery
Cold Water Immersion
Cold water exposure may aid recovery and mood; evidence is mixed and preliminary.
Limited and mixed trial evidence; some positive mood effects.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Trauma & Therapy
EMDR Therapy
Eye Movement Desensitization and Reprocessing is a guideline-recommended treatment for PTSD and trauma processing.
Recognized by WHO, NICE, and APA guidelines; meta-analyses show efficacy for PTSD.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Trauma & Therapy
Trauma Is Not the Event — It Is What Happens Inside
Trauma is the lasting imprint an experience leaves in the nervous system, not the event itself.
Conceptual framework supported by neurobiological and observational evidence; an expert clinical model rather than a single empirical finding.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Trauma & Therapy
Internal Family Systems (IFS)
A parts-based therapeutic approach; emerging evidence supports its use for trauma and distress.
Pilot RCTs and small studies; promising but preliminary.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Community & Wellbeing
Nature Exposure
Time in green environments reduces stress and improves mood and cognition.
Observational and experimental evidence with consistent effects.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Community & Wellbeing
Gratitude Practice
Regular gratitude exercises modestly improve well-being, mood, and life satisfaction.
Multiple RCTs with small-to-moderate effects.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
Community & Wellbeing
Expressive Writing / Journaling
Writing about emotional experiences improves mood and measures of physical health.
Established paradigm (Pennebaker) with multiple RCTs; effects moderate and context-dependent.
Evidence grades: A = high (consistent RCTs / meta-analyses) · B = moderate · C = low (observational / mechanistic) · D = very low / preclinical. Educational content, not medical advice.
This library summarizes peer-reviewed research and clinical guidance for educational purposes only. Grades reflect the strength of the available evidence, not the value of the practice. Always consult a qualified clinician for personal medical decisions.