Brain
Cognition, mood, memory, and neurological health.
Overview
The brain and nervous system govern thought, memory, mood, movement, and the automatic control of the body. Brain health depends heavily on the health of the blood vessels, sleep, and metabolism that supply and protect it.
Why it matters
Cognitive decline and mood disorders are among the most feared and consequential health outcomes, yet a large share of risk is modifiable through vascular health, sleep, activity, and engagement — often decades before symptoms appear.
New to this? Read these first
How this usually unfolds
- Understand the system
- Know the key biomarkers
- Learn the common conditions
- Apply evidence-based interventions
Major functions
- Cognition, learning, and memory
- Mood and emotional regulation
- Movement and coordination
- Sensory processing
- Autonomic control of organs
Common conditions
Prevention
- Control blood pressure and ApoB
- Stay physically active
- Protect sleep
- Treat hearing loss
- Avoid smoking and excess alcohol
Improvement strategies
- Aerobic exercise for cognition and mood
- Treating depression and sleep disorders
- Managing vascular risk factors
- Ongoing learning and social connection
Explore this system across BioSignal
Related Signal Records
Related biomarkers
Related body systems
Related lifestyle interventions
Related diagnostics
Frequently asked questions
Can I really lower my dementia risk?
A meaningful share of dementia risk is linked to modifiable factors — blood pressure, hearing, activity, smoking, and more. None guarantees prevention, but together they shift the odds.
Do brain-training games work?
They mostly improve the specific game you practice, with little proven transfer to general cognition. Exercise, sleep, and vascular health have stronger evidence.
Educational information — not medical advice
Is this hub clear, useful, and well-connected? Your feedback shapes what we review next.
Give feedback