I will say from experience, do not buy the larger sized meal plans. Most of the campus food is mediocre quality and overpriced, and your freshman will get burned out on most of the options within a couple of months. Also, regardless of whether they have a car, they will likely be going off campus to eat with friends quite often, especially early on when their Fish Camp/Impact Camp will likely be doing organized events together. More meals can always be added later if needed.
The one exception is if they are in the Corps, which mandates certain meals for march in, and also logistically makes going off campus more difficult due to being in uniform.