This document defines malnutrition and identifies its types and preventative measures. Malnutrition is poor nutrition resulting from an insufficient or imbalanced diet, poor digestion, or inability to absorb foods. It affects infants, children, the elderly, disabled, and ill. There are two main types: undernutrition and overnutrition. Undernutrition includes protein-energy malnutrition and micronutrient deficiencies like iron deficiency anemia, rickets, and vitamin A deficiency. Overnutrition refers to excessive caloric intake leading to obesity. The document identifies at-risk groups and signs of various deficiencies. It emphasizes preventative measures like nutrition education, food fortification, and supplementation programs.