in perfect harmony i would like to buy the world a coke and keep it company you re getting into it. look at you. go ahead, girl. i used to sing that all the time as a child. really? i m totally dating myself. i m sure your parents loved it. you just heard my singing skills. we ve come a long way from celebrating sugary goodness in a bottle with a little harmony. between pressure from lawmakers and anti-obesity advocates, these are tough times for soft drink makers. so coca cola has unveiled an ad campaign that sings a very different tune. here s abc s jim avila. ice cold coca cola. reporter: coca cola in 1961, advertising the original coke as a diet beverage. there s no waistline worry with coke. reporter: now most studies say that s not true. so a new ad from coke, claiming to be part of the obesity solution, not the problem.
at risk of having a premature baby this, according to a new study looking at premies, finds that artificial sweeteners may be the culprit. we ask a doctor about this, so one out of eight babies, premature. does diet soda play a role in that? there s a new study that was done mainly with danish women, 60,000 pregnant women, drinking diet soda versus drinking soda or other beverages that were sweetened with regular sugar and they found that there was an increased risk of pre-term delivery. now, pre-term delivery means before 37 weeks. jenna: sure. all right so, if you drank at least one diet soda, or i don t want to say soda but any diet beverage with artificial sweetener it put you at a 37 percent greater risk than other women of delivering premature and if you drink more, it puts you at puts you at an 80 percent greater