In what kinds of writing do you use the passive tense more than the active?

As a professional who has been teaching others to write business correspondence for the past ten years, I feel more confident signing off letters or memos that are made up of sentences written in the active voice. Sentences written in the active voice are far more helpful in helping readers to visualize what the writer is trying to say; hence, they promote faster understanding.

Using sentences written in the passive voice gives me a feeling that what I signed off is something I cannot stand by, assert for, and at worst, fight for.

Food is something to eat. or
Food is something to be eaten.

Thanks