Suddenly sour

Yes sour. Sour is something left out to long that ruins...or something that tastes bitter...or something gone bad.  Life can become sour. People can also. Of course food variations are first in my mind when I hear sour...and yet its a diverse word. The choices we make...the little insignificant details...determine what things become sweet or sour. Isn't it amazing what a pinch of sugar does?