Realistically, I doubt it if you could lose 15 before summer, but if you keep up a good progamthroughout the summer I bet you could lose up to 25-30lbs. This is what I'm trying ot do, because as a freshmen in highschool,I find it's hard to eat healthy during the day, (vending machines at lunch and immense appetite when i go home), but I'm doing good. I weigh 154lbs, and my goal is to weigh 130lbs by the end of this year. If yo wanna know any tips just write me on here until I can get an alternate e-mail. *Smylez*