51 | What Happens to Your Brain When You Sit Too Much?

What happens to your brain when you sit too much? Research suggests that prolonged sitting and sedentary behavior may be associated with memory problems, changes in brain structure, and increased dementia risk—even if you exercise regularly. In this episode of RenewHer, Brain Health Coach Genell Lemley explores how sitting too much may affect brain health as we age. Drawing on studies published in Alzheimer's & Dementia (2025) and JAMA (2023), she examines the connection between sedentary behavior, cognitive decline, and dementia risk—and whether regular exercise is enough to offset long periods of sitting. You'll learn why being physically active and spending too much time sitting aren't necessarily opposites, what researchers are discovering about the hippocampus and memory, and why your daily workout may not tell the whole story when it comes to protecting your brain. WHAT WE'LL DISCUSS ➡️ How prolonged sitting may relate to brain health and cognitive decline ➡️ The difference between physical activity and sedentary behavior ➡️ What research reveals about sitting time, hippocampal shrinkage, and dementia risk ➡️ Whether regular exercise can offset long periods of sitting ➡️ Practical ways to incorporate more movement into your everyday routine KEY TAKEAWAY Regular exercise remains important for brain health, but emerging research suggests that how you spend the rest of your day may matter, too. Becoming more aware of prolonged sitting and finding opportunities to move throughout the day may be another way to support healthy aging. RESEARCH & ADDITIONAL RESOURCES 2025 — Alzheimer's & Dementia Increased Sedentary Behavior Is Associated With Neurodegeneration and Worse Cognition in Older Adults Over a 7-Year Period Despite High Levels of Physical Activity https://pmc.ncbi.nlm.nih.gov/articles... 2023 — JAMA Sedentary Behavior and Incident Dementia Among Older Adults https://pmc.ncbi.nlm.nih.gov/articles... These studies identify associations and do not establish that prolonged sitting causes dementia. ENJOYED THIS EPISODE? If you found this episode helpful: 👍 Like this video 💬 Leave a comment and let me know what resonated with you. 📺 Subscribe for more conversations about brain health, healthy aging, and living with clarity, energy, and purpose. 🔔 Turn on notifications so you never miss a new episode. FOLLOW GENELL LinkedIn:   / genelllemley   Facebook:   / renewherwellness   Instagram:   / renewher.wellness   Website;: https://renewherwellness.com — Sign up for Genell’s newsletter: A weekly dose of actionable tips, brain-boosting strategies, and inspiration to sharpen your focus, boost energy, and reclaim your mental clarity. https://renewherwellness.com/newslett... — Subscribe to Genell’s channel here:    / @renewherwithgenell   — Listen to her RenewHer podcast 🎧 Apple: https://bit.ly/RenewHer-Apple Spotify: https://bit.ly/RenewHer-Spotify Amazon Music: https://bit.ly/RenewHer-AmazonMusic KEYWORDS sitting too much, brain health, prolonged sitting, sedentary behavior, sitting and dementia, sitting and brain health, cognitive decline, dementia risk, exercise and brain health, sedentary lifestyle, hippocampus, memory and aging, healthy brain aging, brain health over 50, women over 50, physical activity, cognitive health, neuroscience, RenewHer, Genell Lemley