It appears more people are becoming addicted to fizzy drink.
The family of 30-year-old Natasha Harris has told the inquest into her death they believe her habit of drinking more than seven litres of coke a day contributed to her death.
National Addiction Centre director Doug Sellman says at the moment there isn't formal scientific validity of soft drink addiction.
"But fizzy drink is part of a whole class of new addiction which would be considered under food addiction generally, which is gaining scientific validity very quickly."
Doug Sellman says people around those with such addictions find it hard to say something because they're often met with a negative response.