The freshman 15- the term used for those extra pounds students tend to pack on during their first year in college- is actually about five to seven pounds, according to the most comprehensive study of its kind by Brown University Medical School.

Researchers say possible explanations for the weight gain include more drinking, more socializing that involves eating, highfat foods in dorm cafeterias and less physical activity.

"The freedom associated with kids going off to college can bring about bad habits," said Sunbelt Snacks registered dietitian, Joanne V. Lichten, PhD.

Lichten offers some tips:

•Make time for exercise. Walk or bike to class.

•Don't skip meals, as it leads to overeating at the next meal.

•Watch portion sizes. Just because the cafeteria is allyoucaneat doesn't mean students should.

•Get adequate sleep. New research shows that sleep deprivation leads to weight gain.

•Keep healthy grab-and-go snacks on hand, like fresh fruit, peanut butter and crackers, breakfast bars and granola bars.

"Every whole grain in your diet helps," said Lichten.