Instructions: Indicate the presence of numerical data in the abstract (whether numerical data plays a key role in medical records), solely using the information from the abstract.
Input: Abstract: Patients who had undergone proximal selective vagotomy and who had severe postprandial dumping symptoms took in less food, energy, and nutrients than those who were mildly symptomatic or who were healthy. 
Question: Does the abstract contain any numerical data?
Output:
No