Fizzy drinks have been much maligned due to their high sugar content.
Now doctors warn the cans that they come in could also be bad for a person's health.
A new study has found a common coating used in soft drink cans could cause high blood pressure and put heart patients at risk.
The chemical Bisphenol A - known as BPA - is widely used as a lining for cans and plastic bottles, but previous studies found it can leach into food and drink.
Korean researchers found drinking from cans increased the concentration of BPA in urine by 1,600 per cent when compared to glass bottles.
Drinking two cans a day increased blood pressure by 5 mmg Hg, a rise which would cause 'significant problems' for patients with high blood pressure or heart disease, doctors warned.
Such patients would also need to seek medical if such a rise was seen, they added.
Bisphenol A has already been linked to a host of medical problems, including migraines, obesity, diabetes, infertility, heart attacks and even cancer.
The chemical has already been banned in baby bottles in Europe because of safety fears.
However, the EFSA - the European Food Safety Authority - last year found that BPA posed no appreciable health risk to anyone apart from very young children.
It is currently reviewing its findings, with a new report due before Christmas.
The new study, carried out by the Korean researchers, found ingesting BPA was associated with high blood pressure and changes in heart rate.Dr Yun-Chul Hong, of the Seoul National University College of Medicine, said: 'A 5 mm Hg increase in systolic blood pressure by drinking two canned beverages may cause clinically significant problems, particularly in patients with heart disease or hypertension.
'A 20 mm Hg increase in systolic blood pressure doubles the risk of cardiovascular disease.'
A person is normally said to have high blood pressure if the have a pressure of 140/90 mm Hg or above.
The study involved 60 adults over the age of 60 who were given soy milk from glass bottles or cans three times over the course of the study.
Researchers then measured the level of BPA in their urine, as well as their blood pressure and heart rate two hours after drinking each beverage.
Soy was chosen as it doesn't contain any ingredients that are known to elevate blood pressure.
They found that the concentration of BPA increased by up to 1,600 per cent after consuming canned drinks compared to after consuming the glass-bottled beverages.
Researchers controlled factors such as population characteristics or past medical history.
Time variables, such as daily temperatures, however, could still affect the results, they said.
Dr Hong concluded: 'I suggest consumers try to eat fresh foods or glass bottle-contained foods rather than canned foods.
'Hopefully, manufacturers will develop and use healthy alternatives to BPA for the inner lining of can containers.'
The study was published in the American Heart Association's journal Hypertension.
CHEMICALS USED TO MAKE CASH REGISTER RECEIPTS COULD RAISE THE RISK OF DIABETES, OBESITY AND CANCER
Chemicals used to make till receipts could raise the risk of developing harmful diseases such as diabetes, obesity and even cancer, scientists claim.
Alarming research suggests that a substance used to produce paper in store tills, credit card machines and ATMs could be absorbed into the blood stream.
Researchers say the chemical bisphenol-A - widely known as BPA - can disrupt hormones, raising the risk of a wide number of health problems.
The chemical has already been banned in baby bottles in Europe because of safety fears.
But the transparent resin is still used to line most plastic and tin food packaging - despite the calls for an all-out ban by campaigners.
Source: dailymail.co.uk
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