Which age group is at the greatest risk for undernutrition?

The choice of a 5-month-old infant as the age group at the greatest risk for undernutrition is correct because infants have unique nutritional needs that are critical for their rapid growth and development. During the first year of life, a baby requires a specific balance of macronutrients and micronutrients to support brain development, immune function, and overall physical growth.

Infants are particularly vulnerable to undernutrition because their digestive systems are still developing, and they often rely solely on breast milk or formula, making any nutritional deficiency in these sources detrimental. Additionally, infants are at risk of conditions such as failure to thrive if they do not receive adequate nutrition. This is further exacerbated in situations where access to food, healthcare, and maternal education is compromised, leading to a higher incidence of undernutrition in this age group compared to older populations, who are generally better able to manage their dietary needs or seek medical assistance.

Other age groups mentioned generally have more developed body systems and coping mechanisms for dealing with nutritional deficiencies. They are usually in a better position to address their dietary requirements compared to an infant.