Collins says lack of nutrients is the cause of 3.5 million avoidable deaths annually and the greatest cause of poverty.

FORBES: Seeing the Business Opportunity in Malnutrition

Smoking - the leading cause of avoidable deaths - is now twice as common among groups in lower socio-economic groups.

BBC: Why are we so unhealthy?

Andrew Husband, principle lecturer in pharmacy at the University of Sunderland and lead on the Gateshead study said allergies were a significant cause of avoidable adverse drug reactions among hospital in-patients each year.

BBC: Patients should be asked about allergies on admission