The following represent selected studies from the lifestyle factor literature, by category, that provide evidence for positive brain health outcomes.  This is not intended to be an exhaustive list but rather samples of recent and historical work in different lifestyle factor domains.

Physical activity and cognition reviews/large studies, including optimal exercise dose for cognitive benefits:

Exercise for Cognitive Brain Health in Aging: A Systematic Review for an Evaluation of Dose
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Genetic Insights into the Causal Relationship Between Physical Activity and Cognitive Functioning
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Fitness Effects on the Cognitive Function of Older Adults: A Meta-Analytic Study
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Aerobic Exercise and Neurocognitive Performance: A Meta-Analytic Review of Randomized Controlled Trials
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Optimal Dose and Type of Exercise to Improve Cognitive Function in Older Adults: A Systematic Review and Bayesian Model-Based Network Meta-Analysis of RCTs
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Low-Intensity Daily Walking Activity is Associated with Hippocampal Volume in Older Adults
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Physical Exercise and Cognitive Function Across the Life Span: Results of a Nationwide Population-Based Study
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Physical Activity and Cognitive Function in Middle-Aged and Older Adults: An Analysis of 104,909 People From 20 Countries
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Relationship Between Physical Activity and Cognitive Function in Apparently Healthy Young to Middle-Aged Adults: A Systematic Review
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Timing of Physical Activity Across Adulthood on Later-Life Cognition: 30 Years Follow-Up in the 1946 British Birth Cohort
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Effect of Regular Resistance Training on Memory in Older Adults: A Systematic Review
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A Meta-Analysis of Randomised Controlled Trials of Physical Activity in People with Alzheimer's Disease and Mild Cognitive Impairment with A Comparison to Donepezil
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Effects of physical activity on brain volume and functional activation patterns:

Exercise Training Increases Size of Hippocampus and Improves Memory
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Aerobic Exercise Intervention, Cognitive Performance, and Brain Structure: Results from the Physical Influences on Brain in Aging (PHIBRA) Study
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Effects of Exercise Modes on Neural Processing of Working Memory in Late Middle-Aged Adults: An fMRI Study
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The Effects of Aerobic Exercise on Corpus Callosum Integrity: A Systematic Review
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Hippocampal Sub-Regional Shape and Physical Activity in Older Adults
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Activation of the Orbitofrontal Cortex By Both Meditation and Exercise: A Near-Infrared Spectroscopy Study
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White Matter Plasticity in Healthy Older Adults: The Effects of Aerobic Exercise
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Physical activity and association with reduced dementia risk:

Dementia Prevention, Intervention, and Care: 2020 Report of the Lancet Commission
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Association of Daily Step Count and Intensity With Incident Dementia in 78 430 Adults Living in the UK
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Physical Activity, APOE Genotype, and Dementia Risk: Findings from the Cardiovascular Health Cognition Study
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Midlife Cardiovascular Fitness and Dementia: A 44-year Longitudinal Population Study in Women
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Physical Activity and Alzheimer's Disease: A Systematic Review
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Cognitive benefits of acute periods of exercise:

Acute Exercise Improves Prefrontal Cortex but Not Hippocampal Function in Healthy Adults
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Systematic Review of the Acute and Chronic Effects of High-Intensity Interval Training on Executive Function Across the Lifespan
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The Effects of a Resistance vs. an Aerobic Single Session on Attention and Executive Functioning in Adults
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The Effects of Acute Exercise on Mood, Cognition, Neurophysiology, and Neurochemical Pathways: A Review
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Effects of physical activity on neurotrophic factors and inflammation:

A Meta-Analytic Review of the Effects of Exercise on Brain-Derived Neurotrophic Factor
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The Positive Cognitive Impact of Aerobic Fitness is Associated with Peripheral Inflammatory and Brain-Derived Neurotrophic Biomarkers in Young Adults
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Effect of Leisure Activities on Inflammation and Cognitive Function in an Aging Sample
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Updated Overview on Interplay Between Physical Exercise, Neurotrophins, and Cognitive Function in Humans
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Harnessing the Effects of Endurance Exercise To Optimize Cognitive Health: Fundamental Insights From Dr. Mark P. Mattson
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Physical Exercise and Health: A Focus on Its Protective Role in Neurodegenerative Diseases
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Frequency of social activity

Associations Between Longitudinal Trajectories of Cognitive and Social Activities and Brain Health in Old Age
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A Systematic Review and Meta-Analysis of Structural Magnetic Resonance Imaging Studies Investigating Cognitive and Social Activity Levels in Older Adults
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Greater Social Engagement and Greater Gray Matter Microstructural Integrity in Brain Regions Relevant to Dementia
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Longitudinal Evidence for the Effects of Social Group Engagement on the Cognitive and Mental Health of Chinese Retirees
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Social networks

The Effect of Social Networks on the Relation Between Alzheimer's Disease Pathology and Level of Cognitive Function in Old People: A Longitudinal Cohort Study
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Social Network Characteristics and Cognitive Functioning in Ethnically Diverse Older Adults: The Role of Network Size and Composition
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The Relation of Close Friends to Cognitive Performance in Old Age: The Mediating Role of Leisure Activities
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Social Network Characteristics Moderate Associations Between Cortical Thickness and Cognitive Functioning in Older Adults
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Social Relations and Age-Related Change in Memory
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Social Support

The Impact of Social Activities, Social Networks, Social Support and Social Relationships on the Cognitive Functioning of Healthy Older Adults: A Systematic Review
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Which Aspects of Social Support Are Associated With Which Cognitive Abilities for Which People?
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The Interactive Effects of Education and Social Support on Cognition in African Americans
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Associations Between Social Relationship Measures, Serum Brain-Derived Neurotrophic Factor, and Risk of Stroke and Dementia
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Associations Between Longitudinal Trajectories of Cognitive and Social Activities and Brain Health in Old Age
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Continuing Education for the Prevention of Mild Cognitive Impairment and Alzheimer’s-Type Dementia: A Systematic Review and Overview of Systematic Reviews
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A Systematic Review and Meta-Analysis of Structural Magnetic Resonance Imaging Studies Investigating Cognitive and Social Activity Levels in Older Adults
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Association of Lifetime Cognitive Engagement and Low β-Amyloid Deposition
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Lifecourse Activity Participation From Early, Mid, and Later Adulthood as Determinants of Cognitive Aging: The Lothian Birth Cohort 1921
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Lifestyle Activities and Memory: Variety May Be the Spice of Life. The Women's Health and Aging Study II
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Late-Life Physical and Cognitive Activities Independently Contribute to Brain and Cognitive Resilience
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Cognitive Leisure Activities and Future Risk of Cognitive Impairment and Dementia: Systematic Review and Meta-Analysis
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Specific cognitive/leisure activities

Leisure Activities and the Risk of Dementia in the Elderly
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Playing a Musical Instrument as a Protective Factor against Dementia and Cognitive Impairment: A Population-Based Twin Study
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Association of Crossword Puzzle Participation with Memory Decline in Persons Who Develop Dementia
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The Relation Between Instrumental Musical Activity and Cognitive Aging
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Cognitive Activities and Cognitive Performance in Middle-Aged Adults at Risk for Alzheimer’s Disease
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Mediterranean-style diet

Mediterranean Diet and Age-Related Cognitive Decline: A Randomized Clinical Trial
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Mediterranean Diet, Alzheimer Disease Biomarkers and Brain Atrophy in Old Age
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Mediterranean Diet and 3-year Alzheimer Brain Biomarker Changes in Middle-Aged Adults
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Adherence to the Mediterranean Diet and Academic Performance in Youth: The UP&DOWN Study
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Adherence to the Mediterranean Diet and Academic Performance in Adolescents: Does BMI Status Moderate This Association?
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Association of Mediterranean-DASH Intervention for Neurodegenerative Delay and Mediterranean Diets With Alzheimer Disease Pathology
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MIND diet

MIND Diet Slows Cognitive Decline With Aging
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MIND Diet Associated With Reduced Incidence of Alzheimer's Disease
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MIND Diet, Common Brain Pathologies, and Cognition in Community-Dwelling Older Adults
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Association of Long-Term Adherence to The MIND Diet With Cognitive Function and Cognitive Decline in American Women
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The Mediterranean, Dietary Approaches to Stop Hypertension (DASH), and Mediterranean-DASH Intervention for Neurodegenerative Delay (MIND) Diets Are Associated with Less Cognitive Decline and a Lower Risk of Alzheimer’s Disease—A Review
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Specific dietary components

Association of Dietary Intake of Flavonols With Changes in Global Cognition and Several Cognitive Abilities
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Pelargonidin and Berry Intake Association with Alzheimer's Disease Neuropathology: A Community-Based Study
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Effects of Oily Fish Intake on Cognitive and Socioemotional Function in Healthy 8-9-Year-Old Children: The FiSK Junior Randomized Trial
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Regular Fish Consumption and Age-Related Brain Gray Matter Loss
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Higher RBC EPA + DHA Corresponds with Larger Total Brain and Hippocampal Volumes: WHIMS-MRI Study
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Cognitive Reserve and Social Capital Accrued in Early and Midlife Moderate the Relation of Psychological Stress to Cognitive Performance in Old Age
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Cognitive Reappraisal of Emotion: A Meta-Analysis of Human Neuroimaging Studies

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8-week Mindfulness Based Stress Reduction Induces Brain Changes Similar to Traditional Long-Term Meditation Practice – A Systematic Review
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Mindfulness Practice Leads to Increases in Regional Brain Gray Matter Density
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Activation of the Orbitofrontal Cortex By Both Meditation and Exercise: A Near-Infrared Spectroscopy Study
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Mindfulness and Attention: Current State-of-Affairs and Future Considerations
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Meditation is Associated with Increased Brain Network Integration
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Brief, Daily Meditation Enhances Attention, Memory, Mood, and Emotional Regulation in Non-Experienced Meditators
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In adulthood

National Sleep Foundation’s Sleep Time Duration Recommendations: Methodology and Results Summary
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The Interconnected Causes and Consequences of Sleep in the Brain
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Change in Sleep Duration and Cognitive Function: Findings from the Whitehall II Study
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Subjectively and Objectively Measured Sleep Predict Differing Aspects of Cognitive Functioning in Adults
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Association of Sleep Duration in Middle and Old Age with Incidence of Dementia
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Sleep Disturbances Increase the Risk of Dementia: A Systematic Review and Meta-Analysis
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In childhood/adolescence

Impact of Delaying School Start Time on Adolescent Sleep, Mood, and Behavior
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Longitudinal Outcomes of Start Time Delay on Sleep, Behavior, and Achievement in High School
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Sleepmore in Seattle: Later school start times are associated with more sleep and better performance in high school students
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Sleep, Cognition, and Behavioral Problems in School-Age Children: A Century of Research Meta-Analyzed
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A 2 Year Multidomain Intervention of Diet, Exercise, Cognitive Training, and Vascular Risk Monitoring Versus Control to Prevent Cognitive Decline in At-Risk Elderly People (FINGER): A Randomised Controlled Trial
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The Effect of Multidomain Lifestyle Intervention on Daily Functioning in Older People
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Multidomain Interventions to Prevent Cognitive Impairment, Alzheimer’s Disease, and Dementia: From FINGER to World-Wide FINGERS
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Effect of the Apolipoprotein E Genotype on Cognitive Change During a Multidomain Lifestyle Intervention: A Subgroup Analysis of a Randomized Clinical Trial
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Lifestyle Activities in Mid-Life Contribute to Cognitive Reserve in Late-Life, Independent of Education, Occupation, and Late-Life Activities
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An Active Lifestyle Reinforces the Effect of a Healthy Diet on Cognitive Function: A Population-Based Longitudinal Study
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Lifecourse Activity Participation From Early, Mid, and Later Adulthood as Determinants of Cognitive Aging: The Lothian Birth Cohort 1921
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The Relationship Between Physical Activity and Diet and Young Children's Cognitive Development: A Systematic Review
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Effect of a Purpose in Life on Risk of Incident Alzheimer Disease and Mild Cognitive Impairment in Community-Dwelling Older Persons
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Relationship of Purpose in Life to Dementia in Older Black and White Brazilians
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Effect of Purpose in Life on the Relation Between Alzheimer Disease Pathologic Changes on Cognitive Function in Advanced Age
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Psychosocial Factors Associated with Cognitive Function Among Middle-Aged and Older Hispanics/Latinos: The Hispanic Community Health Study/Study of Latinos and its Sociocultural Ancillary Study
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Purpose in Life and Cerebral Infarcts in Community-Dwelling Older People
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