well for one thing 60lbs is way to little i would go down about to 100 lbs because if you go down that much you will get sick and i mean really sick
-No snacking in between meals
-Eat meals in smaller, more frequent portions.
-No soda. Absolutely none. Either drink water or tea.
-Avoid sugary, oily food.
-Cut down on the potatoes.
-Drink water BEFORE every meal (By doing this you are filling yourself up so you will eat LESS).
-If you DO have the urge to eat, drink water or eat ice-cubes.
-Walk to wherever possible.
You could try the water diet. This works best if you're not going to be doing much for a week. Basically, all you drink is water (with no food), kind of like fasting. For a week. You can easily lose a few pounds by doing this. However, you will need to return to eating normally afterwards.
Or you could try the apple diet (my sister did this). You eat nothing but apples for three days, then you are free to eat whatever you want. (Lol, but she put the weight back on immediately.)
Truly, there's no real quick way to lose weight (unless you get surgery). And you can't get rid of fat from a certain area, so you really need to exercise.
Obviously you will need to change your lifestyle/diet to become more balanced. Squeeze in at least one hour of exercise each day. My friend runs for 45 minutes and dances for 1 hour, by doing this and dieting she successfully lost a few pounds in half a year or so.
Well, some people do grow a bit more afterwards and actually stretch themselves out. If you are overweight during puberty, there is a high chance you will become overweight in the future. Fat doesn't magically disappear one day when you turn 21.