The news often discusses how soda is so awful for you. The sugar in traditional soda, awful artificial sweeteners in diet soda. The claims that soda contributes to obesity, decreased kidney function, diabetes, tooth decay, heart burn etc. Some have even argued soda may contribute to heart disease and cancer. Many schools are now banning soda machines.
Do you think people will look back in say 40 years and think of soda as our generation's tobacco? A ubiquitous drink that is widely accepted by mainstream society as pretty harmless.
Is it possible that one day soda will be forbidden to market to kids? Or do you feel the media is on a witch hunt against soda giants like Coke and Pepsi?
To some degree everything has a downside and as each thing is addressed, new ones will appear that are considered the new nemesis.
Yes, soda/sugar will be vilified, as are fat and Salt. But people will continue to consume stuff that tastes good and some compromise will be made rather than promote a food revolution. (look at the schools "healthy lunch" promoted by M Obama and students throwing it away).
More significantly, many are more than willing to tell others how to live their life, while others will do a tradeoff of quality for quantity. People are what they are.
Drugs are bad, but they are still being consumed/used.