Calorie deprivation - how bad is it really?
Okay, so DH bought me an iPhone for my birthday and I've set it up with their Lose It! app (free, if anyone's got an iPhone and is interested). It's a weight loss program that allows you to record your food intake and exercise. You input your age, current weight, goal weight, and it tells you how many calories you can budget for each day and how long it should take you to reach your goal. My calorie budget is 1553. (ETA to goal weight: July 2010.)
You record everything you eat as you eat it and it tells you how many calories you have left for the day. I've heard of a similar concept with someone doing this by hand using a checkbook register to calculate. When you add in your exercise, it adds back more calories.
I only started a few days ago, on the 25th, and it's an easy program to use, and I already see that I really need to watch my sodium intake and up my protein intake vs. carbs.
On Saturday, when I rode 50 miles, I had a calorie deficit of 1,500. DH said I should eat more that day (this was after we'd already gone to Islands for lunch), so we stopped for frozen yogurt on the way home from driving his century route (he's riding the Tour of Poway this Sunday). I still had a 1,000 calorie deficit for the day.
Now, for you nutrition experts, is that really that bad? Won't my body pull on my fat stores to make up the difference? I didn't work out today and I'm only down 200 calories for the day, so I'm guessing cumulatively, it will even out, but still. Two or three 2,000-calorie deficit days on top of the already-budgeted-to-lose-2lbs-per-week, that would make me lose even more, wouldn't it? Or will it backfire and make my body think it's starving and I'll never drop below 240? Argh. It's just all so doggone complicated.
Roxy