How can I lose about 12-15 pounds if I am already somewhat thin?

Alrighty well heres the best and brightest and easiest way...althought its kind of well...weird lol Running while wearing a trash bag (empty of course) will help that scale decrease in numbers by the second. If you run a mile or 2 on the treadmill no matter how fast you go( but you ahve to run) you will trim down those numbers in absolutely no time...TRY IT it really works..my brother had to do it for his footballl team and he weighed too much for his age group so he went out and ran 2 miles in 1 day wearing a trash bag and dropped 8 pounds imagine if you did that in a week!!!