YUP calorie counting! Think of it like money in the bank. The fat is the money. If you spend more than you deposit eventually the account goes to ZERO!
ALL diet have one thing in common to be successful. You burn more than you take in and you will lose.
It's awesome that you are jumping on this when you don't have a LOT to lose. MAN I WISH I had done something when I was only 40 or 50 pounds overweight but NOOOOO I had to wait until I was 145lbs overweight!