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Burden of malnutrition and sarcopenia in patients with cirrhosis: pathophysiology, assessment, and management

Clinical and Molecular Hepatology 2026;32(2):487-510.
Published online: December 16, 2025

1Department of Medicine, University of California San Diego, La Jolla, CA, USA

2Department of Gastroenterology/Internal Medicine, Graduate School of Medicine, Gifu University, Gifu, Japan

3Department of Medicine, VA San Diego Healthcare System, San Diego, CA, USA

Corresponding author : Bernd Schnabl Department of Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA Tel: +1-858-822-5311, Fax: +1-858-246-1788, E-mail: beschnabl@health.ucsd.edu

Contributed equally and share the co-first authorship.


Editor: Do Seon Song, The Catholic University of Korea, Korea

• Received: October 2, 2025   • Revised: November 10, 2025   • Accepted: December 10, 2025

Copyright © 2026 by The Korean Association for the Study of the Liver

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Burden of malnutrition and sarcopenia in patients with cirrhosis: pathophysiology, assessment, and management
Clin Mol Hepatol. 2026;32(2):487-510.   Published online December 16, 2025
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Burden of malnutrition and sarcopenia in patients with cirrhosis: pathophysiology, assessment, and management
Clin Mol Hepatol. 2026;32(2):487-510.   Published online December 16, 2025
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Burden of malnutrition and sarcopenia in patients with cirrhosis: pathophysiology, assessment, and management
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Figure 1. Causes of malnutrition in patients with cirrhosis. Malnutrition in cirrhosis results from a complex interplay of impaired nutrient intake, altered digestion and absorption, metabolic abnormalities, medications, and disease-related complications. GI, gastrointestinal; SIBO, small intestinal bacterial overgrowth.
Figure 2. Mechanism of sarcopenia in patients with cirrhosis. Cirrhosis is characterized by hyperammonemia and reduced levels of BCAAs due to malnutrition. Hyperammonemia suppresses mTOR signaling and promotes autophagy through the GCN2/eIF2α pathway and via myostatin. Together with alcohol and inflammation, hyperammonemia also induces mitochondrial dysfunction, leading to impaired protein synthesis and enhanced protein degradation. Depletion of BCAAs, IGF-1, and testosterone, further inhibits mTOR activity and diminishes protein synthesis. Moreover, leaky gut and adiposity contribute to systemic inflammation, and pro-inflammatory cytokines increase myostatin expression and activate catabolic pathways, ultimately exacerbating sarcopenia. BCAA, branched-chain amino acid; eIF2α, eukaryotic initiation factor 2 alpha; GCN2, general control nonderepressible 2; IGF-1, insulin-like growth factor 1; IL-6, interleukin-6; JAK, Janus kinase; mTOR, mechanistic target of rapamycin; MuRF-1, muscle RING finger protein 1; NF-κB, nuclear factor kappa-lightchain-enhancer of activated B cells; STAT, signal transducer and activator of transcription; TNF-α, tumor necrosis factor alpha.
Figure 3. Practical strategy for screening, diagnosis, and treatment of malnutrition and sarcopenia in patients with cirrhosis. Malnutrition should be screened using the RFH-NPT, and patients identified as at risk should undergo further evaluation with comprehensive nutritional assessment tools. Although screening tools for sarcopenia remain insufficiently validated, handgrip strength is a simple and practical measure, and individuals with reduced strength should be further assessed for muscle mass. Finally, a multifaceted treatment approach— including dietary modification, late-evening snacks, branched-chain amino acids, micronutrient supplementation, hormonal therapy, ammonia-lowering therapy, and exercise interventions—should be implemented according to the underlying pathophysiology. BCAA, branched-chain amino acid; BIA, bioelectrical impedance analysis; CT, computed tomography; DEXA, dual-energy X-ray absorptiometry; RFH-GA, Royal Free Hospital-Global Assessment; RFH-NPT, Royal Free Hospital-Nutritional Prioritizing Tool; SGA, Subjective Global Assessment.
Burden of malnutrition and sarcopenia in patients with cirrhosis: pathophysiology, assessment, and management
Nutritional screening and assessment tools Included variables Key characteristics and strengths Limitations and weaknesses
Screening tools
 RFH-NPT • Disease condition • Developed for liver disease • Limited applicability outside liver disease
• Fluid retention • Short time assessment • Relatively complex and requires training
• BMI • Ability to identify malnutrition
• Weight change • Ability to predict complications
• Dietary intake • Ability to predict mortality
 NRS-2002 • Age • Developed for hospital setting • Age adjustment required
• Disease condition • Two step screening • Does not consider fluid retention
• BMI • Evidence in various diseases
• Weight change • Ability to identify malnutrition
• Dietary intake • Ability to predict mortality
• Moderate reproducibility
 MUST • Disease condition • Developed for community setting • Limited evidence in patients with cirrhosis
• BMI • Evidence in various diseases • Does not consider fluid retention
• Weight change • High reproducibility • Difficult to reflect disease severity
• Dietary intake
 MNA-SF • Morbidity • Developed for home-care setting • Limited evidence in patients with cirrhosis
• Disease condition • Evidence in various diseases • Does not consider fluid retention
• Neuropsychological problems • Ability to identify malnutrition • Contains many subjective components
• BMI • Moderate reproducibility
• Weight change
• Dietary intake
• Calf circumference
Assessment tools
 SGA • Morbidity • Use subjective assessment • Not quantitative
• Disease condition • No equipment required • Lack independency with liver functional reserves
• Weight change • Ability to predict mortality • Low agreement with other nutritional measures
• Dietary intake • High reproducibility • Preferably performed by trained personnel
• Subcutaneous fat mass
• Muscle mass
• Fluid retention
 RFH-GA • BMI • Developed for liver disease • MAMC requires calculation
• MAMC • Ability to predict mortality • Reference values of MAMC is not standardized
• Dietary intake • High reproducibility
• Includes objective indicators of body composition
 GLIM criteria • BMI • Developed as a global consensus • Limited evidence in patients with cirrhosis
• Weight change • Two step approach including screening and assessment • Muscle mass assessment limits practicality
• Muscle mass • Includes objective indicators of body composition • Uncertain determination of inflammation/disease burden
• Dietary intake • Ability to predict mortality • Uncertain cutoff values for Asian population
• Inflammation/disease burden • Diagnosis differs according to the screening tool
Screening tools and diagnostic criteria for sarcopenia Included variables Key characteristics and strengths Limitations and weakness Cutoff values
Screening tools
 SARC-F • Strength • A self-reported questionnaire • Limited evidence in patients with cirrhosis • Sarcopenia: SARC-F ≥4
• Assistance with walking • No equipment required • Low sensitivity
• Rising from a chair • High specificity
• Climbing stairs
• Falls
 Finger-ring test • Calf circumference using a finger-ring • No equipment required • Limited evidence in patients with cirrhosis • Calf circumference compared to finger-ring: Male, just-fits and smaller; female, smaller
Diagnostic criteria for older people
 EWGSOP2 • Muscle strength • Developed for European older people • Developed for European older people • Handgrip strength: Male <27 kg; female <16 kg
• Muscle mass or quality • Validated in various populations • Cutoffs may not apply to Asians • ASMI: Male <7.0 kg/m²; female <5.5 kg/m²
• Physical performance • Accepts various methods for assessment • Gait speed <0.8 m/s
• Defines severe sarcopenia • 5-time chair stand test ≥12 s
• Short physical performance battery ≤9
 AWGS 2019 • Screening for sarcopenia • Developed for Asian older people • Developed for Asian older people • Handgrip strength: Male <28 kg; female <18 kg
• Muscle strength • Validated in various populations • Limited data in liver disease • ASMI (DEXA): Male <7.0 kg/m²; female <5.4 kg/m²
• Physical performance • Includes screening and diagnosis • ASMI (BIA): Male <7.0 kg/m²; female <5.7 kg/m²
• Muscle mass • Defines severe sarcopenia • Gait speed <1.0 m/s
 SDOC • Handgrip strength • Developed by the global experts • Excluded muscle mass • Handgrip strength: Male <35.5 kg; female <20 kg
• Gait speed • Included independent factors for health-related outcomes • Validated mainly in North America • Gait speed <0.8 m/s
• Excluded assessment of muscle mass • Limited data in liver disease
Diagnostic criteria for patients with cirrhosis
 EASL • Muscle mass • Summarized for patients with cirrhosis • No cutoff values for functional measures • SMI (CT): Male <50 cm²/m²; female <39 cm²/m²
• Handgrip strength as supportive • Accepts various methods for assessment
• Frailty measures as supportive • Recommends reassessment
 AASLD • Muscle mass • Divides sarcopenia with frailty • No cutoff values for functional measures • SMI (CT): Male <50 cm²/m²; female <39 cm²/m²
• Also recommends frailty assessment • Evidence mainly in transplant candidates
• Accepts various methods for assessment
• Recommends reassessment
 JSH • Handgrip strength • Developed for liver disease • Limited evidence outside Japan • Handgrip strength: Male <28 kg; female <18 kg
• Muscle mass • Explicit diagnostic criteria • SMI (CT) : Male <42 cm²/m²; female <38 cm²/m²
• ASMI (BIA): Male <7.0 kg/m²; female <5.7 kg/m²
Interventions for malnutrition and sarcopenia Characteristics Evidence and strength Limitations and weakness
Optimizing calorie and protein intake • Calorie intake: 35 kcal/kg/day • Fundamental treatment with high-protein requirement even with hepatic encephalopathy • Poor appetite and ascites reduce intake
• Protein intake: 1.2–1.5 g/kg/day and up to 1.2–2.0 g/kg/day in critically ill or postoperative patients • Low cost and widely applicable • Difficult balance in obesity
• Oral or enteral feeding with multiple small meals • Improved sarcopenia measures and hepatic encephalopathy in RCT
Late evening snack • Oral carbohydrate and/or protein before sleep to prevent overnight catabolism • Low cost and widely applicable • Long-term continuation and patient engagement
• Improved total body protein in RCT • Risk of hyperglycemia
• Improved survival in retrospective study • Limited evidence on survival
BCAA supplementation • Oral BCAA granules or enteral formulas • Improved event free survival, serum albumin levels, and HRQOL in RCT • Long-term continuation and patient engagement
• Improved hepatic encephalopathy in meta-analysis • Limited evidence on survival
• Reduced hepatocellular carcinoma in prospective observational study • Controversial results for sarcopenia in RCTs
• Evidence mainly from Japan
• Availability vary according to country
Zinc supplementation • Zinc deficiency causes taste loss, anorexia, and hyperammonemia • Improved hyperammonemia in RCT • Limited numbers of RCTs
• Improved hepatic encephalopathy in meta-analysis • Limited evidence on survival
• Oral or intravenous supplementation • Possible gastrointestinal symptoms and copper deficiency
Vitamin D supplementation • Vitamin D deficiency is associated with osteoporosis and sarcopenia • Improved sarcopenia in RCT • Limited evidence in meta-analysis
• Recommended oral supplementation in patients with vitamin D levels <20 ng/mL • Improved bone mineral density in RCT • Limited evidence on survival
• Risk of hypercalcemia
Carnitine supplementation • Oral or intravenous levocarnitine supplementation • Improved hepatic encephalopathy in RCT • Limited evidence in meta-analysis
• Improved muscle mass and survival in a retrospective study • Limited evidence on survival
• Evidence mainly from Italy
• Cost and insurance vary by country
Exercise therapy • Includes aerobic, resistance, and combined training • Low cost and widely applicable • Long-term continuation and patient engagement
• Frequency: 3–5 sessions/week • RCTs and meta-analyses demonstrated sarcopenia improvements • Lack of standardized protocols for liver disease
• Intensity adjusted to fatigue and tolerance • Consideration of safety in patients with decompensation
• Limited evidence on survival
Table 1. Nutritional screening and assessment tools

BMI, body mass index; GLIM, Global Leadership Initiative on Malnutrition; RFH-GA, Royal Free Hospital-Global Assessment; RFH-NPT, Royal Free Hospital-Nutritional Prioritizing Tool; MAMC, mid-arm muscle circumference; MNA-SF, Mini Nutritional Assessment-Short Form; MUST, Malnutrition Universal Screening Tool; NRS-2002, Nutritional Risk Screening-2002; SGA, Subjective Global Assessment.

Table 2. Sarcopenia screening tools and diagnostic criteria

AASLD, American Association for the Study of Liver Diseases; ASMI, appendicular skeletal muscle mass index; AWGS, Asian Working Group for Sarcopenia; BIA, bioelectrical impedance analysis; BMI, body mass index; CT, computed tomography; DEXA, dual-energy Xray absorptiometry; EASL, European Association for the Study of the Liver; EWGSOP, European Working Group on Sarcopenia in Older People; JSH, Japan Society of Hepatology; SDOC, Sarcopenia Definitions and Outcomes Consortium; SMI, skeletal muscle mass index.

Table 3. Interventions for malnutrition and sarcopenia

BCAA, branched-chain amino acid; RCT, randomized controlled trial.