Why do I keep gaining weight after I stopped drinking and eating bad food?

Anonymous
My undergrad diet was awful but I only gained 12 pounds in college and went from 5"9 158 to 5"11 170 from 18-21. My diet was mess hall food for a year then cheap beer that the upperclassmen bought for me for 2 years. Then I was 21 and got an apartment and lived on frozen pizza, easy Mac, wine (alot of wine), and ham sandwiches. I was awlays skinny and now that I'm in grad school i only drink once a week and learned to like vegetables, fruits, and salad while being overall healthier. I also picked up basketball again and play three days a week. With that said I've gained 10 pounds in the past year and since I don't lift it's not muscle. I haven't had to buy clothes but I'm gaining weight for sure.
Why do I keep gaining weight after I stopped drinking and eating bad food?
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