Charles H. Spurgeon on Psalms 107:18

Their soul abhorreth all manner of meat. Nor is it without emphasis that it is not the sick man who is said to spurn food, but his soul ...The Hebrew word vpn which properly means a breath, hence a panting appetite, is applied to a very vehement appetite for food. When, therefore, the soul is said to abhor food, it is equivalent to saying for the vehement appetite for food abhors food: that is, in the place of an appetite for food, they are oppressed with a loathing; when they ought to be moved with a sharp desire of food, that their exhausted powers might be refreshed, appetite itself becomes a loathing of food, which is a most vivid description of the utmost loathing, and utter prostration of all desire. —Venema.