Sugar gets all the blame, and fat is ignored even though consumption of both have increased (in the US) over time. And fat is confusing to people because nowadays plenty of people believe saturated fat is ok. I'd support a soda tax though.
For instance, when I buy groceries at walmart, if they don't have tyson boneless chicken that i want but instead great value boneless chicken, and I need chicken, I'm going to buy the great value chicken. Likewise in the scenario, if all fruit juices contained far less sugar, all of the country could adapt. If they want more sugar, nothing is stopping them from manually adding it themselves.
Extra taxes are just imposed upon lower classes. Just because you charge more from an item doesn't stop poor people from buying it. It just makes them poorer.