This is a bit late and rather off topic... but for those who are experiencing a drastic spike in food usage, I recently found out that the Healing Factor perk can be the culprit. While I have played around 2000 Steam hours of 7DTD (Since A13 or 14 I think?), I never realized this when the park was added. The tooltip specifies "This perk does not work while you are starving" but I had always thought it was designed to stop healing you otherwise you wouldn't starve to death from damage. It seems the mechanic is similar to that of Minecraft, where is drains your hunger bar to replace your health bar.
Just wanted to chime in since I saw some people talking about severe hunger. If the Devs could update the tooltip with the words "drains hunger" I wouldn't be upset xD Anywho, I'm rambling... Carry on! ^_^