You, my friend, are a healthy person. You don't need the NYC soda ban to keep you from over-consuming unhealthy, corn-syrupy soda. You don't get the Big Gulp soda. You don't get the large. You get the medium.
But what does that actually mean? Do you know?
Probably not. As NPR's The Salt writes, although people make decisions based on size labels, they don't really know how much food or drink they're consuming. University of Michigan Professor Aradhna Krishna proved this (with science!):
In one experiment, she gave people cookies that were labeled either medium or large, and then measured how much they ate.
The catch? The cookies were identical in size.
What happened? You guessed it. People ate more cookies when they were labeled "medium." Rather than trust what their stomachs were telling them, in other words, people went by the label.
It's sort of like when McDonald's tells you their new wraps are "healthy," because, hey, they're not a burger. You tend to believe that they are healthy, even though there is the same breaded, fried chicken in it as in a sandwich.