GLIMcriteria

GLIM criteria, short for Global Leadership Initiative on Malnutrition, is a collaborative framework established to provide a globally applicable standard for diagnosing malnutrition in adults. The initiative emerged from consensus among major nutrition societies in 2018 and has since been adopted in clinical and research settings to harmonize malnutrition diagnosis across diverse populations.

The GLIM diagnostic process is a two-step approach. First, individuals at risk are identified through a validated screening tool. If risk is indicated, a diagnostic assessment is conducted using the GLIM criteria. A diagnosis of malnutrition requires at least one phenotypic criterion and at least one etiologic criterion, with severity graded primarily according to the phenotypic criterion.

Phenotypic criteria encompass observable body-related changes: unintentional weight loss, low body mass index (BMI), and reduced muscle mass. These criteria can be assessed using a variety of validated methods, including imaging, bioelectrical impedance, anthropometry, or other body composition measurements.

Etiologic criteria pertain to the underlying causes related to nutrition: reduced food intake or assimilation, and disease burden or inflammatory conditions. The presence of one etiologic criterion, in combination with one phenotypic criterion, establishes a malnutrition diagnosis.

GLIM is designed for broad applicability, allowing different measurement techniques while emphasizing standardized diagnostic logic. It is intended for adults across hospital, outpatient, and long-term care settings. While the criteria provide a unified framework, thresholds for BMI and muscle mass are method- and population-specific, and measurements can be influenced by fluid status and other factors, necessitating careful assessment.