Do you mean Ohio State? If so, I believe they require students to stay on campus for two years now. I have three sons who all graduated from OSU, but that wasn't a requirement when they were there.
ETA: I think it cost us more for food when the boys were away. Meal plans were ridiculously expensive when they were living on campus. Once they moved off campus, they lived frugally but I think it was still cheaper to just cook big meals at home than it was to have everyone eating separately. I did get spoiled not to have to cook so much and have so many dishes! When they come home now it's a big adjustment for me to have to shop, cook, and clean up from the huge meals.
Luckily Ohio State only requires a second year on campus for students who go directly to college after HS, and DS is taking a gap year this year. So he will be exempt from the requirement, since his sophomore year of college will not fall "within two years of HS graduation." Hopefully that will reduce his expenses by $3000/yr or more.
As for food, we're probably at the extreme end of the spectrum, given that DS is a 6'6" 220 lb athlete who trains 15-20 hrs/wk — he eats more food than DD, me, and the dog combined! Plus DD and I are about 90% vegan, whereas the bulk of DS's diet is meat, dairy, and eggs (all of which I try to buy organic/free-range/grass-fed/pastured), so I'm stuck making separate meals anyway. A typical breakfast for DS would be 4-5 eggs, scrambled or in a cheese omelet, 5-6 breakfast sausages, and 2 pieces of whole wheat toast with butter and Marmite, whereas DD and I will have a cup of tea and a piece of fruit. He eats a big lunch and dinner (totally separate from what DD and I eat), then he'll have a couple of Cliff bars and a sports drink during practice, and after practice he'll have a 32 oz protein smoothie (almond milk, frozen fruit, banana, Greek yogurt, and 2-3 scoops of Orgain or Vega protein powder) plus a cup of cashews or an apple and peanutbutter. Meanwhile DD and I usually have a salad for lunch and something like a stir-fry or vegetable curry for dinner. So I expect our food bill to go waaaay down once DS leaves!
I expect the opposite, though, when DD leaves for college — no scholarships, no reduction in sports/competition expenses, no reduction in gas/insurance costs (she will almost certainly stay in state and take a car with her), plus any campus meal plan is likely to cost a lot more than I currently pay for her food. So I'm very grateful that I will basically break even with DS!