Most Alzheimer's sufferers aren't diagnosed until their 70s. However, we now know that their brains began deteriorating long before that.

Mental health can be just as important as physical health - and major depression is one of the most commonly diagnosed mental illnesses.

In my clinical practice, the one diagnosis I always dreaded giving was Alzheimer's. Billions have been spent on research, but there's still neither a cure nor an effective treatment.

Most of us know that the hormone melatonin helps regulate our sleep. But it also seems to play another role - suppressing cancer growth.

Cholesterol - which you get from eating too much of the wrong kind of fat - doesn't just help clog arteries in the brain, it may also help to seed the amyloid plaques that riddle the brain tissue of Alzheimer's victims.

In nature, disease-causing strains of avian influenza rarely spread far because the birds sicken and die before they can fly to spread it to others.