I'm a glutton so I love all the things that I love, and instead of having it all the time, now I'm trying to be a little more precious of when I got the things I love I think it makes them more important.
The etiquette of the sandwich lunch requires everyone to take less than they want, in order to signal to the wider group that they are team players who know how to share, not gluttons bingeing on free food.
Some may believe that snacks are unhealthy because they include too much salt, sugar, and fat, as well as a number of additives that are difficult to identify, while individuals who can't resist snacks are considered gluttons.