If I genetically modified a human to have a foxtail of roughly 1 metre length through the use of handwaved genetical engineering - would this have an effect on his diet?
Of course an additional appendage means that the human would have to eat a bit more to power for example the muscles that are needed to move the tail. I was thinking about this while reading an article about Keratin, which is the main structural material that is used to construct hair. A foxtail of ~1 metre length would add a lot of fur to the human's body, so I would imagine that this slightly skews the kind of nutrients the human would need.
But I don't know if this would have any significant influence on the diet of this human - would it be like an intense craving for certain kinds of food as an essential part of their diet at times or would it be more like a preference to munch an apple every other day, something like a favourite snack?
My goal is to get an idea of how adding one fluffy upscaled tail similar to that of an Arctic Fox would influence my human's diet so that I could estimate the influence of adding multiple tails for my medieval anthropomorphic foxes. You've got to know how to properly feed your troops if you want morale to remain high.