Maybe, in hobbit history, there was a great shortage of food. They declined in size from normal men so as to need less energy. Their thoughts in this starvation were always on food because they needed it to survive.
But once this starvation had ended, their thoughts were still centred on food as a result.
Thats quite a plausible theory i made up on the spot there! It also explains why theyre smaller than other men.
By the way, I dont think JRRT ever thought about any of this. I think we're taking all this way too deep and way too seriously.
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