Pro-Con Debate: 1- vs 2-Hour Fast for Clear Liquids Before Anesthesia in Children. 3 Sep, 2021 | 09:55h | UTC Pro-Con Debate: 1- vs 2-Hour Fast for Clear Liquids Before Anesthesia in Children – Anesthesia & Analgesia Related: ESPEN practical guideline: Clinical nutrition in surgery – “Preoperative fasting from midnight is unnecessary in most patients. Patients undergoing surgery, who are considered to have no specific risk of aspiration, shall drink clear fluids until 2 h before anesthesia. Solids shall be allowed until 6 h before anesthesia.”