Charles H. Spurgeon on Psalms 78:18

Asking meat for their lusts. God had given them meat for their hunger in the manna, wholesome, pleasant food, and in abundance; he had given them meat for their faith, out of the heads of Leviathan which he brake in pieces, Ps 74:14. But all this would not serve, they must have meat for their lust; dainties and varieties to gratify a luxurious appetite. Nothing is more provoking to God, than our quarrelling with our allotment, and indulging the desires of the flesh. Matthew Henry.