freshmen fifteen

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The context is: Many arrive at school with a desire to be attractive to peers and potential romantic partners, and a worry about gaining the “freshmen fifteen.”
And the definition: The term "Freshman 15" is an expression commonly used in the United States that refers to an amount (somewhat arbitrarily set at 15 pounds (7 kg), and originally just 10 lbs (5 kg)[1]) of weight gained during a student's first year at college.
But I can't find a Spanish equivalent.