This is another truth I learned the painful way. Seeing your several hundreds of funds VANISH because you were a little too relaxed a little too often when it came to buying food, snacks etc is damn saddening.Pretty much what Ivain said on the first page, also the fact that most people aren't good at money management at that time in their life, yet. Also, as someone with experience : college easily eats away at any funds you try to save up.
Yes, going out and getting take away or a burger is easy, but those meals do add up, and for the same price, you could easily make yourself 2-3 of the same meal by buying the ingredients yourself.
And to think that that shit happened to me just from buying a bit too much take-out style food, while there's people my age that party nearly every weekend and spend literal hundreds per month just on alcohol and whatnot.