Pediatric Undernutrition: A Case-Based Nutrition Update for Physicians

Course Description:

Pediatric undernutrition is often underrecognized in clinical practice, even among children who appear healthy and whose caregivers do not report concerns about growth. Through the case of a preschool-aged girl with declining BMI despite normal height growth, this activity highlights the importance of routine growth monitoring and the use of z-scores to identify growth faltering and nutritional risk before more severe undernutrition develops. Clinicians will review the prevalence and causes of pediatric undernutrition, including inadequate intake, increased energy expenditure, and impaired nutrient absorption or utilization. The program also explores practical, evidence-based nutrition interventions, including dietary counseling and oral nutrition supplements (ONS), and demonstrates how early identification and intervention can support improved growth outcomes.

Course Objectives:

• Recognize the prevalence of pediatric undernutrition in global clinical practice
• Discuss the difference between the use of growth curves versus z-scores 
• Describe the three causes of pediatric undernutrition 
• Apply evidence-based nutrition interventions, including oral nutrition supplements (ONS), and assess growth outcomes following intervention

Key Takeaways:

• Undernutrition is more common than expected
• Routine measurement of weight, height, and z -scores are essential to identify undernutrition early and prevent it from being overlooked 
• Inadequate intake is the primary driver of undernutrition, though increased energy needs and poor nutrient absorption may contribute
• ONS combined with dietary counseling supports growth and food intake compared to counseling alone, without replacing table food consumption

Related Questions:

• How can clinicians identify growth faltering before severe undernutrition develops?
  Routine monitoring of weight, height, BMI, and age-appropriate z -scores can help identify declining growth trajectories before severe deficits occur. Reviewing longitudinal growth patterns is often more informative than relying on a single measurement.
  
• Why are z-scores preferred over percentiles when assessing pediatric growth?
  Z-scores are one of the most important and sensitive tools for assessing pediatric undernutrition. They measure the number of standard deviations that a data point is from the mean of a reference population, allowing clinicians to identify growth faltering earlier than percentiles alone. Because z-scores track changes continuously over time, they help detect declining growth trajectories, support malnutrition diagnosis, and guide timely nutrition intervention before severe undernutrition develops.