New Defender's Study Bible Notes
106:15 leanness. Instead of the nourishing manna, the “bread from heaven,” which they despised (Numbers 21:5), God sent them a surfeit of bird-meat, which became “loathsome” (Numbers 11:20) when it caused a great plague that took many lives (Numbers 11:33,34). The word “leanness” refers basically to physical emaciation, but may here refer to an even more sobering warning. If our prayers focus primarily on physical rather than spiritual desires, God’s answer may be one of physical satiation but spiritual poverty.