Instructions: Given an abstract, generate a keyword (a noun phrase) that best describes the focus or contribution of the paper. Such keywords can be directly from the given abstract or outside it.
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.
Output:
Caloric Intake