Ward was about to drink his cup of tea when he noticed a speck of plaster dust floating in it. Yet in the wake of their having survived the air raid, the speck of plaster dust was nothing. Whereupon he gulped his tea. All of this, says the psalmist, is sweet to his taste . The psalmist certainly knows what malnutrition looks like.
Malnourished people are weak, listless, indifferent, pallid, pale, dull, dull-eyed.
Spiritual malnutrition exhibits comparable spiritual symptoms. The psalmist saw it all around him. The psalmist was born 1000 years before Christmas. You and I were born 2000 years after Christmas. This fact doesn't affect truth but it does affect vocabulary.