Diet Power is a decent software tool for tracking how much nutrition you get out of the calories you do take on board. I use it from time to time to make sure I'm getting all of the right amounts of micronutrients in my diet. I used it initially to get a sense of what I needed to eat to get the right balance of fat, protein, and carbohydrates.
I highly recommend a book called "Sports Nutrition" by Monique Ryan. She also writes a column for VeloNews. This woman knows nutrition and she also knows cycling. I've used a lot of her advice for fine tuning pre-ride and post-ride meals.
With respect to the 1200 calorie issue, it seems low to me. Even for a sedentary person. But my real concern is whether one can get decent nutrition in a 1200 calorie diet.
traveller
"It never gets easier, you just go faster." -- Greg LeMond