Undernutrition (Protein-Energy Malnutrition)

Undernutrition, particularly protein-energy malnutrition (PEM), occurs when the body lacks sufficient calories and protein to meet its basic needs. It is most common in children in low-income regions but can also affect adults during illness, food scarcity, or poor dietary intake. PEM mainly presents in two severe forms: marasmus and kwashiorkor. Marasmus is characterized by extreme wasting, loss of muscle and fat, and a very thin appearance due to prolonged calorie deficiency. Kwashiorkor, on the other hand, results from inadequate protein intake despite some calorie consumption and is marked by edema, swollen abdomen, skin changes, and hair discoloration.

Undernutrition weakens the immune system, making individuals more vulnerable to infections such as diarrhea, pneumonia, and other illnesses. It also impairs physical growth, cognitive development, and overall productivity. In children, it can cause stunting, delayed milestones, and reduced learning ability. Pregnant women with undernutrition may give birth to low-weight infants, perpetuating a cycle of poor health.

Addressing PEM requires timely nutritional support, including balanced diets rich in protein and energy, breastfeeding promotion, and access to healthcare. Public health initiatives, food security, and education about proper nutrition play a vital role in prevention and recovery.