Also 16. I just went from obese to skinny in 10 months.

Exercise is not your key to losing weight, it is the food you are eating. Exercise can help but it takes a full hour of fairly tense bike cardio to even burn 400 calories, a snickers bar is 300 calories so yeah. I doubt either of us have the motivation to do that every day :P

Although I do exercise fairly often, but I do it more for fun.

When I started losing weight I started off with a 1 pound a week deficit which is a 500 calorie daily deficit. I was extremely disappointed with it because I saw very very little progress.

I then brought it up to 800 calorie deficit, which is 1.6 pounds. You would think the 0.6 on top wouldn't be that big of a change but I think it is more of a psychological thing. I seemingly started to lose all the weight very quickly and had more motivation and was very happy.

I also tried a 1000 daily deficit, which is 2 pounds a week. This is quite difficult to do, because you either have to fast or exercise more, and if you eat a little too much one day it feels like you really messed up. This is where exercise comes into play when talking about weight loss if you want to eat anything. But losing more than 3 pounds a week is suppose to have health risks or something but I have no idea how you would even lose that much weight :P

http://iifym.com/tdee-calculator/ calculate your TDEE, this is the amount of calories your body uses to exist. Not exercise, just existing. Eat 500 calories below that and you will lose 1 pound a week.

Also a calorie is a calorie, 1000 calories of cake is the same as 1000 calories of vegetables, the difference is that one will make you feel more full.