In a letter to Jeremy Hunt, doctors say persuading people to eat a Mediterranean diet is 'best strategy available'
The battle against dementia should be refocused away from "dubious" drugs to the benefits of a Mediterranean diet, a group of doctors and health workers said ahead of an international summit.
In a letter to the health secretary, Jeremy Hunt, they said persuading people to eat fresh fruits and vegetables, nuts, fish and olive oil was "possibly the best strategy currently available".
Dementia experts from G8 countries will gather in London this week for a meeting convened by the prime minister, David Cameron, as part of the UK's presidency of the group of leading economies.
Hunt has called dementia a health and care "timebomb" with the number of people living with the condition expected to triple worldwide to 135 million by 2050, according to a recent report.
There is also a lack of diagnosis in England and Wales – with fewer than half of cases formally recognised by GPs and patchy performance across different areas. Critics of current policies are also concerned about high levels of anti-psychotic drug prescription.
Among signatories to the letter were former chair of the Royal College of General Practitioners, professor Clare Gerada, the chair of the National Obesity Forum, professor David Haslam, professor of Clinical Epidemiology at the University of Liverpool Simon Capewell and London cardiologist Dr Aseem Malhotra.
They said successfully encouraging people on to a healthier diet could have a far greater impact in the fight to reduce the dramatically increasing rates of the disease than pharmaceutical and medical interventions and "the dubious benefit of most drugs". It can also protect against coronary heart disease, hypertension and diabetes.
Research by the University of Exeter's Medical School found a majority of studies suggested the diet could improve cognitive function, lower rates of decline and reduce the risk of Alzheimer's disease.
However, results for mild cognitive impairment – the stage before Alzheimer's or dementia, when someone could be experiencing some cognitive difficulties – were inconsistent.
Dr Malhotra said: "The evidence base for the Mediterranean diet, in preventing all of the chronic diseases that is plaguing the western world is overwhelming.
"This includes cardiovascular disease, type 2 diabetes, Alzheimer's and cancer.
"Policymakers and the public need to know that such a diet is far more potent than the often dubious benefit of many medications and without side-effects."
Dr Simon Poole, a leading advocate of the Mediterranean diet who organised the letter, said: "Educating all generations, including our children, in the importance of a good diet in maintaining health in old age is a project which will take years, but is absolutely essential.
"We are calling upon policymakers to not only support the care and treatment of those who are already suffering from dementia, but to make significant investments in work which will see benefits beyond the period of one or two parliaments."