Classes for the fall semester started this (Monday) morning at Iowa’s three public universities, and it’s hard to be an incoming first-year student and avoid hearing about the dreaded “Freshman 15.” Women’s health internist Dr. Denise Millstine (MILL-stine) says weight gain is often caused by a change in activity levels and a change in eating habits when teens transition from high school to college.

Millstine offers a few tips to stay in shape, starting with making sure you’re eating right and getting plenty of rest.

Millstine says college freshman typically gain around seven or eight pounds their first year, not the dreaded 15.