It's easy and quite common to believe that illness and early death is due to factors such as disease, poor diet, lack of exercise, obesity, smoking and genetic disorders.
But according to the results gained from nearly 30 years of research by Sir Professor Michael Marmot, those factors account for around one quarter of the causes of illness and early death.
The primary, majority cause of illness is "psycho-social" – our personal beliefs and expectations, and the social environment (community, nation and culture) in which we live.
