Unfortunately, 2 lbs per week is likely not going to be possible for you. You're simply not fat enough! If you were over 200 lbs, that might be possible.
It may happen in the first few weeks, (many people experience a quick initial loss thanks to water retention) but the less you have to lose, the slower it is going to come off. With 50 lbs, you'd be aiming for around 1.5 lbs or so... a good rule of thumb is you can aim to lose about 3% of your total remaining loss per week. You will not continue to lose 2 lbs throughout, because the less you have to lose, the slower it will go. When you have 20 lbs to go, you'll be losing at a rate of around half a pound a week. At 10 lbs, around .25 lbs per week!
50 lbs in 7-8 months is likely too aggressive, and will result in burnout and potentially failure at worst.
Here's how Sparkpeople calculates its calories: www.sparkpeople.com/resource/calorie_calcu
All you need to do is set a *reasonable* goal, update it every 10 or 15 lbs, and put that into the SP settings and it will generate a range for you. Include your weight loss goals first, then add your fitness goals, and it will do the rest for you.
Your range will change as you lose weight; I started out at around 1900-2200 (when I was 210 lbs and working out 5 days a week for an hour or more) and is now down to 1600-1900 working out three or four days a week for an hour or less.
Edited by: DRAGONCHILDE at: 4/1/2013 (17:23)