Malnutrition is a broad condition resulting from an imbalance in the intake of energy, proteins, and essential micronutrients. This deficiency or surplus can manifest in various ways, including protein-energy malnutrition, resulting from inadequate caloric intake, or excesses that lead to conditions such as obesity. The physiological consequences of malnutrition affect multiple organ systems, impairing growth and development, weakening immune function, and detrimentally affecting metabolic processes. Addressing this complex health issue requires understanding nutritional biochemistry and optimizing the balance of necessary dietary components to support optimal human physiological function.