How much weight can I realistically lose?

Unless you're being watched by a doctor, don't do too low calorie of a diet. Aim for ~1500. At your size, that will help the weight come off more steady, and (hopefully) without making your skin too saggy when you do. You could try something like weight watchers - I myself did it for some time (until it was just too costly for me to keep going - and I found that going to meetings really helped me. (Once I stopped meetings, my motivation rather sagged. Not pretty.) I'm sure there are online communities that you can find for support, if WW isn't your thing. I do recommend getting your hands on a WW cookbook - they have really good recipes that are tasty without being too calorie laden.

Also check out the book 'The Diet for Teenagers Only' ( http://www.amazon.com/Diet-Teenagers-Only-Barbara-... ). It has a lot of tips that you might find helpful. It helped me lose weight back in high school (until I was a stupid person and began skipping meals... don't do that. It's not good for your body...)

As far as I know, a reasonable weight loss per week is 1-2 pounds. So, 20-40 pounds would be a guess of what you could lose, as long as you are getting in that sweet spot of enough-but-not-too-many calories.

You should try insanity and follow the meal plans my brother lost 50+ pounds by following everything in 2 snd a half months goodluck and that should help insanity can be a bit pricey but it really works (:

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Don t go back to old eating habits even after you lose weight

Sweet potatoes help you lose weight

fast food is salty food if you cut back on the salt in a few weeks youll be able to better taste the natural salts in food and may not crave the junk as much as you used to

Proteins takes more time to digest than carbs so eating protein will make you feel full for longer

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dont be too strict with the calories, aim for 1500 as a minimum you might damage your metabolism if you go any lower and you are only young

create emergency packs filled with healthy foods such as nuts fruits or sliced vegetables to help you avoid unhealthy temptations