Them Dwarven folk.

[Aganzir]

I don't think (even food) trade with hobbits is a completely impossible thought. It just doesn't make sense that the dwarves had no way to get food without trading, which I think is what you zxcvbn are saying (or at least coming up with points that back it up).

I bet it takes more people & resources to travel quite a distance just to buy food than it takes to farming, keeping of cattle, hunting or whatever. And dwarven products would sell even without barter.

How many dwarves live in the Blue Mountains anyway? Even though dwarves were a dwindling race at the end of the Third Age, I dare to say there were still more than could be feeded with traded food only.

And how much food does a dwarf consume per day? How much does a dwarf work per day? Buying all their food would soon have made their work unprofitable.