Final answer:
Elderly individuals may need fewer calories due to a decrease in lean body mass, but they require more protein to maintain muscle mass, repair tissues, and support immune function.
Step-by-step explanation:
As individuals age, their lean body mass decreases, which may lead to a reduction in calorie needs. However, the elderly may need more of another nutrient to maintain their health. They may need less calories, but more protein.
Protein is essential for maintaining muscle mass, repairing tissues, and supporting immune function, all of which are critical for older adults. Additionally, since the metabolic processing of protein requires the most energy, it can help in managing weight when consumed in appropriate amounts, as it may increase the metabolic rate and contribute to a feeling of fullness. Contrary to proteins, fatty foods are more calorie-dense and might not be the best choice for elderly individuals who require fewer calories but need to maintain their nutritional status. Carbohydrates and fiber are also important parts of a balanced diet; they provide energy and support digestive health respectively. However, protein is notably important for elderly individuals due to its role in maintaining muscle mass and overall body functions.