Can I Lose 90lbs In A Year?

I believe I can, I believe with the right diet, dedication and some help with a program called P90x. My goal is to weight 200lbs by Christmas 2010. I will starting this Monday (December 21, 2009) at the weight of around 290, I will officially weigh myself the morning I start my first day of the program. P90x is built on a 90 day cycle so I will do 4 cycles with 12 phases and mix it up with different routines provided with the program and others found on the internet. I will need to work hard, rest when needed and recover properly to avoid injuries. I will be keeping track of my progress and take measurements after every phase (approx 28 days) to see where changes may be needed and where I am finding my best results.

My biggest obstacle is not the exercise, it is the diet. I am a big guy but I can move pretty good because I gained weight because of bad eating habits not lack of exercise. I will follow the P90x eating plan as closely as possible for the first cycle, allowing one cheat meal every Sunday if deserved (However I will always account for those calories so I will eat ~1000 less calories spread over the 7 days).

I will start week 1 by eating 3029 calories per day and slowly lower my calories to 2188 by week 52. This will be set out and I will watch this very closely and keep a log of my calorie intake every day. I was going to start with a lower calorie amount but I don't want to starve myself and with 365 days there is no rush to hurt my body or progress.

I am really excited to do this. I have tried to get my butt in gear in the past but never felt so good about my goals and plan to feel comfortable in what I am doing. I will do my "Fit Test" the Sunday before day 1 and see where my progress goes on day 28.