> If I have leftover food of certain things, I tend to throw it away and rather buy fresh.

I find it difficult to appreciate this viewpoint. There's a certain elegance in using your resources efficiently and not wasting things. I find it significantly more satisfying to find a use for things rather than discarding them. This also applies to possessions, and more abstract things like writing code and not wasting lines of code or memory, or writing and not wasting words.