Obesity (BMI) & Brain Health

Small changes in weight. Big benefits for your brain.

Body weight isn’t just about how we look – it affects how our brain functions. Excess weight, especially around the midsection, increases inflammation, disrupts metabolism, and raises our risk for conditions that directly harm your brain.

The link between obesity and dementia is well established. But here’s the good news: even modest, healthy weight loss can lead to measurable brain benefits. And it’s never too late to start!

Brain Benefits of a Healthy BMI

• Reduces inflammation that accelerates brain aging

• Improves memory, focus, and cognitive flexibility

• Supports healthier blood flow to brain tissue

• Lowers risk of vascular dementia and Alzheimer’s disease

• Boosts energy, mood, and motivation, fueling other brain-healthy habits

What the Science Says

• Obesity in midlife increases dementia risk by up to 70% later in life.

• Excess visceral fat (around the organs) is linked to brain shrinkage and poorer memory performance.

• Losing even 5–10% of your body weight can improve insulin sensitivity, reduce inflammation, and support cognitive function.

Want to learn more about the connection between weight (BMI) and brain health?
Head over to our Resources & Studies page and click on Obesity & Brain Health to learn how managing weight can support clearer thinking and reduce long-term dementia risk.

Take the Next Step

Wondering how your current weight may be affecting your brain? Healthy Brain Plan helps you understand the connection and take small, sustainable steps toward a healthier mind and body.