Silly or not, I frequently take some food on trips for a variety of reasons. There are good arguments as to why this isn't worth the bother, but here is how I do it:
I pack to food in a soft-sided cooler. I have a couple of sizes, including a back-pack cooler and one that is a little bigger but collapsible. I place everything that can possibly leak in a Zip-Lock bag. Anything that can be frozen, I freeze first and pack it frozen. If it can't be frozen, I at least have it refrigerated first. Then I just add some good ice packs--the kind in the white bags that are the same they ship food to you from same of the prepared food services. Things I sometimes take include frozen steak, frozen hamburger patties, condiments.
I place the cooler in a standard suitcase and check it. Depending upon the size of the cooler and suitcase, there may be room for other things, including food items not requiring refrigeration. I have never had an issue doing this, and even if on the road 12+ hours, the frozen food is still frozen on the other end. This is really pretty easy, and I like to have a cooler on the other end anyway. Of course, make sure there on no prohibitions at the other end on any of the type of food packed.
Note that because of my airline status, I get 3 free 70 lb checked bags per person. If I was paying to check every bag and limited to 50 lbs each, it would definitely change the calculation. In my situation, it would not be worth it.