6 Lifestyle Mistakes That May Increase Risk of Brain Health Damage

Neurologists are cautioning that rising summer temperatures and prolonged heatwave conditions in parts of the country are increasing the risk of dehydration—and, in turn, affecting brain health.

The brain depends on proper hydration to regulate memory, focus, mood, and overall nerve function. Even mild dehydration can trigger headaches, reduce mental alertness, and increase fatigue. Experts warn that certain everyday habits may worsen fluid loss without people realising it, placing additional stress on the nervous system during extreme heat. According to Dr Kunal Bahrani, Chairman & Group Director – Neurology at Yatharth Hospitals, several common lifestyle mistakes can significantly impact brain health in summer.

Relying on soda or coffee instead of water

One of the most common mistakes is replacing water with caffeinated or sugary drinks. While tea, coffee, soft drinks, or energy drinks may feel refreshing, excessive caffeine can increase fluid loss through urination and worsen dehydration.

Neurologists say reduced hydration can lower blood flow and oxygen supply to the brain, leading to dizziness, poor concentration, irritability, and headaches. In extreme heat, combining energy drinks with dehydration may also increase heart rate and fatigue.

Exercising in extreme heat

Working out during peak afternoon temperatures is another major risk. Outdoor runs, high-intensity training, and long gym sessions in heat can quickly raise body temperature.

Without proper electrolyte replacement, sweating can disturb sodium and potassium balance—both essential for nerve and muscle function. In severe cases, overheating may cause confusion, cramps, fainting, or heatstroke, which can damage the brain. People with epilepsy, migraines, or blood pressure issues are especially vulnerable.

Ignoring early signs of dehydration

Many people overlook early warning signs such as dry mouth, headaches, dizziness, fatigue, or difficulty concentrating. These symptoms are often the body’s first neurological signals of dehydration.

If ignored, the condition can progress to confusion, severe weakness, or even temporary loss of consciousness. Office workers, students, and people in air-conditioned environments are also at risk, as cooler temperatures can suppress thirst and reduce water intake.

Poor sleep in summer

High night-time temperatures can disrupt sleep quality, preventing the brain from recovering from heat stress. Sleep deprivation combined with dehydration can impair cognition, affect mood, and trigger anxiety or migraines.

Neurologists emphasise that adequate sleep is essential for maintaining healthy brain function, especially during extreme weather conditions.

Skipping meals or crash dieting

Avoiding meals in hot weather or following restrictive diets can reduce electrolyte intake. The body relies on nutrients and minerals from balanced meals, fruits, and vegetables to maintain hydration and support brain and nerve function.

Not drinking enough water throughout the day

Experts stress that hydration should be consistent, not dependent on thirst alone. Water-rich foods such as watermelon, cucumber, and oranges can also help maintain fluid balance.

Doctors also advise limiting caffeine, avoiding peak afternoon heat, and recognising early dehydration symptoms before they escalate. With rising global temperatures, maintaining hydration is increasingly important not just for physical health, but for long-term brain and neurological well-being.