I am one of those people who the studies actually do apply to. I have been in maintenance for well over a year now, and I still have to be very vigilant about my diet. I have tested it a few times, and I quickly gain weight back.
I believe that I have a similar problem to others here. The reason why programs that emphasized cutting back on certain foods (but still allowing them), didn't work for me, is because I simply cannot eat those foods. If I eat even a little bit of cake or ice cream, I want more and more and more. There is a trigger turned on inside my head that makes me crazy. If that's not addiction, I don't know what is? So, I have decided to cut them out of my life, yes, forever. People occasionally will say to me "oh come on, you can have just one cookie"! They don't realize how untrue that statement is. It would be like saying to a drug addict, "here you can take just one pill". Of course they can't.
What made things different for me this time, compared to my many other attempts, is that I simply cut those foods out. Basically all sugar is gone from my diet. Maybe it's because I'm older (48) and closer to death

, so the sacrifice doesn't seem so monumental , I don't know. But, I do know that seriously, without sugar, I feel free. I don't feel like at any moment I'm going to go nuts and eat everything in sight. I finally have some control over my food choices, for the first time in my adult life.
I became vegan a year ago and it has been the best thing I've ever done in my life as far as my food choices go and in many other ways. People will always tell you, "you can't cut out certain types of foods completely, it will backfire on you". I don't believe this. I believe that it's the types of foods that we allow ourselves to eat that backfire on us.
Congratulations on your weightloss so far! You're doing great. I think it's wonderful that at 19, you're inquiring about maintenance. I never looked past the diet of the week when I was your age. You can do this! Best wishes.