A patient tells the nurse they cannot afford to buy meat every day. Which of the following meals should the nurse suggest as a good source of protein that is also budget-friendly?

Choice A reason: The 10-20% range is too low for protein intake in adults. Protein should contribute 20-35% of calories to meet amino acid needs for muscle maintenance, enzyme production, and immune function, as lower intakes may lead to deficiencies in active individuals.

Choice B reason: The 45-65% range corresponds to carbohydrate recommendations, not protein. Proteins at this level would exceed metabolic needs, potentially straining kidneys due to excess nitrogen excretion, and are not aligned with standard dietary guidelines for adults.

Choice C reason: The Dietary Reference Intake recommends proteins provide 20-35% of daily calories for adults, balancing amino acid needs for tissue repair, enzyme synthesis, and immune function. This range supports metabolic demands without overloading the kidneys with excess nitrogen waste.

Choice D reason: The 35-45% range overestimates protein needs for most adults. Excess protein intake beyond 35% may lead to increased nitrogen excretion, potentially stressing kidneys, and is not typically required unless under extreme conditions like intense athletic training.

Choice A reason: Physical activity level influences energy expenditure but is secondary in unexplained weight loss. Low activity may contribute to muscle loss, but it does not directly indicate nutritional status or underlying causes like malnutrition or disease, which are more urgent to assess in a 65-year-old.

Choice B reason: Blood albumin levels (3.5-5.0 g/dL) reflect protein status and nutritional health, critical in unexplained weight loss. Low albumin indicates malnutrition or illness (e.g., cancer, liver disease), which may cause weight loss in older adults, making it the priority assessment to guide diagnosis and intervention.

Choice C reason: Current medications can cause weight loss (e.g., diuretics), but their impact is secondary to nutritional status. Assessing medications provides context but does not directly measure protein deficiency or disease, which albumin levels better indicate in the context of unexplained weight loss.

Choice D reason: Family history of chronic illness informs long-term risk but is not immediate in assessing recent weight loss. It provides background for conditions like cancer but does not directly address current nutritional or metabolic status, making it less urgent than albumin levels.