For proof you can look at product advertising.
For many years Hawaiian Punch was a big seller and all the commercials and even the can had huge letters that stated that it contained 10% real fruit juice.
Why would anyone buy this garbage that was 90% “something else”? Because market surveys proved that consumers thought it meant that HP had 10X as much fruit juice as the other brands!
That’s pretty sad. When I was a kid, I was never allowed to have that sugar water marketed as “juice”. Same thing with “cheese food”. It’s amazing how easily people can be misled...