Manava Dharmashastra 4.218

4.218

rājānnaṃ teja ādatte śūdrānnaṃ brahmavarcasam
āyuḥ suvarṇakārānnaṃ yaśaś carmāvakartinaḥ //

The food of a king impairs his vigour, the food of a Sudra his excellence in sacred learning, the food of a goldsmith his longevity, that of a leather-cutter his fame;