This is the first time that evidence has emerged of the association between higher BPA levels and disease in adults.
BPA is a controversial chemical commonly used in food and drink containers. It has previously caused concerns over health risks to babies, as it is present in some baby’s bottles.
BPA is used in polycarbonate plastic products such as refillable drinks containers, compact discs, some plastic eating utensils and many other products in everyday use.
It is one of the world’s highest production volume chemicals, with over 2.2m tonnes produced in 2003, with an annual growth in demand of between six and 10 per cent each year.
Many previous studies in laboratory animals have suggested that BPA is safe, but some laboratory studies have raised doubts.
Experiments in which mice and rats were exposed to BPA have shown that higher doses of the chemical can lead to liver damage, insulin resistance, diabetes and obesity.
The laboratory animal evidence is complicated and controversial – some scientists believe that BPA can disrupt the work done by hormones, especially oestrogen, but the full biological effects of BPA in humans are far from clear.
The research team analysed information from the US government’s National Health and Nutrition Examination Survey (NHANES) 2003-2004, the only large-scale data available on BPA concentrations excreted in urine.
The team analysed the results for the 1,455 adults aged between 18 and 74 for whom measures were available – this study group is representative of the general population of the US.
The analysis found that the 25 per cent of the population with the highest BPA levels were more than twice as likely to have heart disease and/or diabetes, compared to the 25 per cent with the lowest BPA levels.
Higher BPA levels were also associated with clinically abnormal liver enzyme concentrations.
While the study identified a statistical association between BPA and adult diseases for the first time, much more research is needed.
Future work needs to exclude the small possibility that the association is due to some other unstudied factor, or that people with these diseases somehow become more exposed to BPA.
It is also unclear whether the liver enzyme changes are linked to liver damage.
David Melzer, professor of epidemiology and public health at the Peninsula Medical School in Exeter, who led the team, said: ‘Our study has revealed, for the first time, an association between raised BPA loads and two common diseases in adults.
‘At the moment we can’t be absolutely sure that BPA is the direct cause of the extra cases of heart disease and diabetes: if it is, some cases of these serious conditions could be prevented by reducing BPA exposure.
‘This is therefore an exciting finding, but it is also just the first step in understanding the role of BPA.’