Protein Calorie Malnutrition Diagnostic Criteria and Management

Diagnostic Criteria

Protein calorie malnutrition is defined as a condition of decreased body stores of protein and energy fuel that can occur regardless of cause and is associated with diminished functional capacity related to metabolic stresses, according to the European Society for Clinical Nutrition and Metabolism 1, 2
Non-volitional weight loss of 5-10% within the past 6 months or 10-20% beyond 6 months is considered moderate, while weight loss of >10% within the past 6 months or >20% beyond 6 months is considered severe, as stated by the American Society for Parenteral and Enteral Nutrition 3, 4
Low BMI, with moderate being <20 kg/m² if <70 years old and <22 kg/m² if ≥70 years old, and severe being <18.5 kg/m² if <70 years old and <20 kg/m² if ≥70 years old, is a diagnostic criterion, as recommended by the European Society for Clinical Nutrition and Metabolism 3, 4
Reduced muscle mass, assessed through validated methods, is also a diagnostic criterion, according to the American College of Nutrition 3, 4
Reduced food intake or assimilation, with moderate being any reduction below energy requirements for >2 weeks and severe being ≤50% of energy requirements for >1 week, is an etiological criterion, as stated by the American Society for Parenteral and Enteral Nutrition 3
Disease burden/inflammation, such as acute illness or chronic disease-related, is another etiological criterion, according to the European Society for Clinical Nutrition and Metabolism 3, 4

Weight and height measurements to calculate BMI, corrected for fluid retention, are essential for assessing nutritional status, as recommended by the European Society for Clinical Nutrition and Metabolism 1, 2
Skinfold measurements to assess fat stores and handgrip strength as a functional measure are also important assessment tools, according to the American College of Sports Medicine 1, 2
Serum proteins, such as prealbumin and retinol-binding protein, which have shorter half-lives and better reflect recent nutritional changes, should be measured, as stated by the National Institute of Diabetes and Digestive and Kidney Diseases 5
Total lymphocyte count and electrolytes, minerals, and triglycerides should also be assessed, according to the American Society for Clinical Pathology 5
Functional assessment using validated scales, such as the WHO or Karnofsky scale, is crucial for evaluating functional capacity, as recommended by the World Health Organization 6

In liver disease, protein calorie malnutrition is found in 65-90% of patients with end-stage disease, highlighting the need for early nutritional support, as stated by the American Association for the Study of Liver Diseases 1, 2
In kidney disease, limitations of BMI use in overhydrated patients may lead to underestimating malnutrition, emphasizing the importance of accurate fluid status assessment, according to the National Kidney Foundation 7, 4

Dietary restriction risks worsening protein calorie malnutrition in patients with end-stage liver disease, underscoring the need for careful nutritional management, as recommended by the European Society for Clinical Nutrition and Metabolism 1, 2
High-quality protein intake of 1.2-1.5 g/kg/day should be the foundation of treatment, according to the International Society of Sports Nutrition 8
Early nutritional support, within 48 hours of hospital admission, is crucial for preventing further muscle wasting, as stated by the American Society for Parenteral and Enteral Nutrition 8

The European Society for Clinical Nutrition and Metabolism (ESPEN) recommends using validated screening tools such as the Nutritional Risk Screening 2002 (NRS-2002) for surgical and critically ill patients, and the Subjective Global Assessment (SGA) for geriatric patients 9
The Mini Nutritional Assessment Short-Form (MNA-SF) is suitable for polymorbid patients including those with cognitive dysfunction, and the Global Leadership Initiative on Malnutrition (GLIM) criteria is a two-step approach with screening followed by assessment 10
Functional status should be documented using validated scales such as the WHO or Karnofsky scale, which can help assess the severity of malnutrition 11
Monitoring dietary intake for several days using semi-quantitative methods can help identify patients who require nutritional intervention, with food intake equal to or less than 50% of energy requirements over 3 days triggering intervention 12

Restrictive diets should be avoided due to the risk of worsening malnutrition, and multiple dietary restrictions can lead to reduced food choices and increased risk of malnutrition 12