Definition: Malnutrition is a condition resulting from an imbalance of nutrients in the body, which can be due to either an inadequate intake, an excessive intake, or an improper absorption of energy and essential nutrients, leading to impaired physical and mental health.
Malnutrition is a broad term encompassing both undernutrition and overnutrition. Undernutrition includes wasting (low weight-for-height), stunting (low height-for-age), underweight (low weight-for-age), and micronutrient deficiencies (e.g., iron, vitamin A, iodine). These conditions arise from insufficient food intake, poor dietary quality, or recurrent illness, significantly impacting growth, development, immune function, and cognitive abilities, particularly in children. Conversely, overnutrition, characterized by overweight and obesity, results from excessive calorie intake relative to energy expenditure, often leading to diet-related non-communicable diseases like type 2 diabetes, cardiovascular disease, and certain cancers.
From a public health perspective, malnutrition represents a critical global challenge, affecting billions worldwide. Undernutrition remains a leading cause of child mortality and morbidity in low- and middle-income countries, trapping individuals and communities in cycles of poverty due to reduced productivity and increased healthcare burdens. Simultaneously, the global prevalence of overweight and obesity is rising rapidly across all income levels, presenting a different but equally significant burden on healthcare systems and individual well-being. Addressing malnutrition requires multi-sectoral approaches targeting food security, nutrition education, healthcare access, sanitation, and sustainable food systems to ensure optimal nutrient intake throughout the life course.
Key Context:
- Undernutrition: Includes stunting, wasting, underweight, and micronutrient deficiencies.
- Overnutrition: Encompasses overweight and obesity, contributing to diet-related non-communicable diseases.
- Double Burden of Malnutrition: The coexistence of undernutrition and overnutrition within the same population, household, or even individual.