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Objective: A vegetarian very low-protein diet (VLPD) supplemented with ketoanalogues of essential amino acids Ketoanalogue-supplemented very low-protein diet (sVLPD) delays dialysis initiation in patients with chronic kidney disease (CKD). In this cost-effectiveness analysis, we compare an sVLPD with a conventional low-protein diet (LPD) in patients with CKD stage 4-5 using data from Taiwan and Thailand., Design and Methods: A Markov model simulated health outcomes and care costs in patients receiving an sVLPD (0.3-0.4 g/kg-day, vegetarian diet) supplemented with ketoanalogues (1 tablet/5 kg-day) or an LPD (0.6 g/kg-day, mixed proteins). Health state transition probability and resource cost inputs were based on published literature and local sources, respectively., Results: An sVLPD increased survival and quality-adjusted life years (QALYs) at a lower cost than an LPD. Total cost of care in Taiwan was 2,262,592.30 New Taiwan dollars (NTD) (68,059.35 EUR) with an LPD and 1,096,938.20 NTD (32,996.18 EUR) with an sVLPD (difference -1,165,654.10 NTD; -35,063.17 EUR). Total cost of care in Thailand was 500,731.09 Thai baht (THB) (14,584.12 EUR) with an LPD and 421,019.22 THB (12,262.46 EUR) with an sVLPD (difference -79,711.86 THB; -2,321.66 EUR)., Conclusion: A ketoanalogue-supplemented vegetarian sVLPD increased QALYs and lowered lifetime care costs versus an LPD in patients with predialysis CKD in Taiwan and Thailand. These data, together with the new KDOQI Guidelines for nutrition in CKD, support dietary intervention using ketoanalogue-supplemented vegetarian sVLPDs to prevent CKD progression and postpone dialysis as a cost-effective approach, with beneficial effects for patients and health care providers., (Copyright © 2022. Published by Elsevier Inc.)