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Caffeine is a stimulant that acts on the brain and nervous system.

A fatigued person is accident prone and more likely to make mistakes and bad decisions.

Without treatment, frequent and prolonged panic attacks can be severely disabling.

Activity and nutrition help fight fatigue and put more energy into your daily life.

What we eat affects our physical health and our mood and mental wellbeing.

Most women take a drug of some kind during pregnancy, sometimes without realising the potential for harm.

If you don’t have enough calcium in your diet, your bones will eventually become weak and brittle.

Essential tremor causes involuntary shaking or trembling of particular parts of the body, usually the head and hands, but it is not Parkinson's disease.

Heroin is a depressant of the central nervous system, which means it slows down brain function and particularly the control of breathing.

Restless legs syndrome has been described as a type of cramp, soreness or a creeping, crawling feeling.