Hunger in Peaceful Mode

I've seen an influx of people agreeing with me online in wanting an option for hunger to effect the player in peaceful mode. This could be in the form of a command (most efficiently) or a new game mode altogether. Using the command /domobspawning in an easy or harder world is an inefficient way to meet this request, as it also prevents passive mobs from spawning. This seems like an important issue to consider as most players wanting hunger in peaceful mode are those who enjoy farming, and want it to serve more of a purpose.