Final answer:
Malnutrition in the elderly is most likely to affect those who have certain diseases, are in poverty, or have a lack of access to nutritious foods. Medical conditions, such as cancer and Alzheimer's disease, can cause malnutrition, as well as poor oral health.
Step-by-step explanation:
Malnutrition in the elderly is most likely to affect those who have certain diseases, are in poverty, or have a lack of access to nutritious foods. Many medical conditions can cause malnutrition, such as cancer, inflammatory bowel syndrome, AIDS, Alzheimer's disease, and psychiatric illnesses like anorexia. Additionally, poor oral health can contribute to malnutrition in the elderly.