You will be given a definition of a task first, then some input of the task.
Given an abstract of a paper, generate a title for this paper such that conveys the key focus of the paper.

Abstract: The urine urea nitrogen/urine creatinine excretion ratio (UUN/UCr) of a "spot" urine specimen obtained approximately 5 hours after the last meal of the day can be used to accurately calculate the urinary urea excretion for the previous 24-hour period. Because UUN excretion is largely determined by dietary intake of protein nitrogen, this method can be used to estimate dietary protein intake for the previous 24-hour period. Strategies for using this simple method for inexpensively and continuously monitoring dietary protein intake are discussed.
Output:
Simple method for monitoring 24-hour urinary urea nitrogen excretion.