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To address the question about how protein requirements change as a person gets older, let's analyze the provided statements and determine the correct understanding of protein needs throughout different life stages. 1. **Proteins requirements increase through childhood and the teen years, then level off for adults.** - This statement is accurate. During childhood and adolescence, the body is growing and developing, which increases the need for protein to support growth and muscle development. Once a person reaches adulthood, the protein requirements stabilize. 2. **Protein requirements decrease because older adults need less energy.** - This statement is partially true. While it is true that older adults may have lower energy needs due to decreased physical activity and metabolic rate, their protein needs do not necessarily decrease significantly. In fact, some studies suggest that older adults may benefit from higher protein intake to help maintain muscle mass and strength. 3. **Protein requirements change significantly without any specific pattern.** - This statement is misleading. While protein needs do change throughout life, they generally follow a pattern based on growth stages and aging, rather than being random. 4. **Protein requirements remain the same throughout life.** - This statement is incorrect. Protein needs vary significantly at different life stages, particularly during growth periods and as one ages. ### Conclusion: The most accurate understanding is that protein requirements increase during childhood and adolescence, level off in adulthood, and may need to be adjusted in older age to help maintain muscle mass and overall health. Therefore, the first statement is the most correct.