The biggest thing is what this previous poster said "Honestly it's a matter of just exercising self control". It took me a bit in college to adjust but then I became a master at finding cheaper food and savings in other areas.
1. I bought a jug of protein powder and would go to the college gym everyday. I would then just chug some water and powder mix. After awhile I got use to being full with that for awhile. ALSO! going to the gym will keep you healthy to eat cheap nasty crap like ramen, starchy foods (actually helps with gaining muscle), pizza at events, ect.. Last thing about the gym, if you go everyday, you could shower there also and get infinite amount of hot water, which I loved abusing, also it will cut your water usage at home a lot! It will also help drop electric bills because you will cool down in the nice gym or school classrooms.
2. Go around campus and look for posting for events. I know my college had them all over for research projects. They invite you to answer a few questions and you get free food or money. Also, my community college had a church near by that fed college kids for free. I use to eat there a lot but also would help clean up and empty all of the trashes in the church to help back a bit. By scavenging for food at school like this, I was able to save tons on eating. It is shocking how many events are going on and how many great people you will meet.
3. Save while eating out with friends. Its hard to avoid your friends all the time that want to go out to drink and eat. Well the way I would save is eat before you go out with them (eat ramen at home are an apple and banana). That way you are there to just chat and interact, my friends never cared. Also, they tend to leave a lot of food leftover and I would gladly finish it for them (whole tenders, entire steaks, ect..,but not nasty chewed food or messed with food). For the drinking part, just try avoid drinking while at a bar or going out. It's very costly, "But hey!! I want to be with friends!!" well you can still go, just do not drink, tell the bar tender that you are the DD and they normally give you free sodas all night. If my friends are really pressuring me to drink, I go to the server and ask them to put the coke in a mug and when they bring it to announce its a rum and coke (it actually works, just tip them a bit for doing that favor).
This is just a small list of what I did back in college a few years ago. If you want to hear anymore, please ask! This advice might sound stupid but it worked and this was before I found MMM.