When Using Up Leftovers Is a Waste of Resources

Tesyaa left this comment on Why You Should Eat Everything on Your Plate:

Another thing about waste – quite often I’ve tried to avoid waste by making, say, a banana bread with overripe bananas, or using up rice in some other type of dish. Those items use energy to cook, and use other ingredients. If there is no real need for banana bread, making it to use up old bananas just wastes oil, eggs, sugar, & flour.

To me, avoiding foood “waste” is only helpful if it frees up other food items. If not, it’s not doing anyone any good.

I’m not sure what you mean when you write “there is no real need for banana bread.”