Chapter 4 · Knowledge and Renunciation of Action · Krishna said
Bhagavad Gita 4.30 — Restraint in eating
अपरे नियताहाराः प्राणान्प्राणेषु जुह्वति। सर्वेऽप्येते यज्ञविदो यज्ञक्षपितकल्मषाः ॥
apare niyatāhārāḥ prāṇānprāṇeṣu juhvati | sarve'pyete yajñavido yajñakṣapitakalmaṣāḥ ||
Meaning
Others, eating with restraint, offer their life-breaths into the life-breaths. All these know what yajna is, and through it their wrongs are washed away.