I got into a discussion with a lady on this facebook group I'm in, that insists it's not necessary to change out the hummingbird food. I told her she should either do it right or not do it at all because the mold that develops kills, but she said she'd been doing it that way for fifteen years without any problems.
But, then she went as far as to say the sugar is a preservative.
I replied, with that, they won't need to embalm me when I die with all the sodas I drink.