Researchers conducted computer assisted telephone interviewing among sixteen thousand nine hundred and seven participants aged sixteen years and older in South Australia between March 2008 and June 2010 inquiring about soft drink consumption comprised of coke, lemonade, flavored mineral water etc. The study was led by Z Shi, MD, PhD, of the University of Adelaide.
The amount of soft drink consumption is associated with an increased chance of asthma and/or COPD. Results showed that daily, more than half a liter of soft drink was consumed by one in ten adults in South Australia. The more soft drink one consumes the higher the chance of having these diseases - it is a dose-response relationship.
Consumption of more than half a liter of soft drink per day, overall, was 13.3% of participants with asthma and 15.6% of those with COPD war reported.
Comparing those who consumed more than half a liter of soft drink per day with those who did not consume soft drinks, the odds ratio for asthma and COPD was 1.26% and 1.79%.
Especially for COPD, smoking makes this relationship even worse. Those who consumed more than half a liter of soft drink per day and were current smokers had a 6.6-fold greater risk of COPD, compared with those who did not smoke and consume soft drinks.
Z Shi concludes, "Our study emphasizes the importance of healthy eating and drinking in the prevention of chronic diseases like asthma and COPD".