Diet fizzy drinks increase the risk of killer health problems.
A study has claimed that drinking sugar-free sweetened drinks raises the risk of heart disease and stroke by 10 per cent, with less than a can a day enough to cause health damage.
Millions drink diet fizzy drinks as they have zero calories but scientists in France claim it is incorrect to think of artificial sweeteners as a safe swap for sugar.
Writing in the British Medical Journal, lead author Dr. Mathilde Touvier - from the French National Institute for Health - said: "This study suggests an association between higher artificial sweetener consumption and increased heart disease risk.
"Artificial sweeteners are in thousands of food and beverage brands worldwide.
"However, they remain a controversial topic and are currently being re-evaluated by health agencies."
Dr. Touvier added: "These food additives, consumed daily by millions of people, should not be considered a healthy and safe alternative to sugar."