by Melendez » Wed Jan 12, 2011 1:03 pm
A couple of other things people should acknowledge from the outset. Over a sustained period, you will only lose 2lbs of fat per week (I say "only, when you think of the size of 2lbs of lard and lose that 10 weeks in a row it's a substantial amount, more than your Christmas Turkey). You have to consume 3500 less calories than you burn to lose 1lb, so you will need to consume 1000 calories a day less than you are burning to lose 2lbs in a week. Initially you can lose a little more than 2lbs of fat but not as much as 3. In the first couple of weeks, if you increase your water intake regularly you can lose over a stone. This will mostly be water, as the body is used to us underhydrating and stores it. When you start taking water regularly (3 litres per 200lbs bodyweight is about right - proportionately up or down) your body quite quickly adjusts and doesn't bother storing it anymore. Although not fat, It still is a permanent weight loss as long as you keep up drinking the water, and has the same effect in that it will make exercise easier, take pressure off joints just as if you'd lost fat.
You can calculate your BMR (calories needed to breathe for 24 hours) on calculators all over the web and then apply a factor to this based on your daily activity levels (in fact skip the BMR and just find a calculator that does that) to get your daily calorie needs to maintain your weight. Then eat 1000 calories less. If you create a bigger deficit than 1000 calories you will lose more than 2lbs of weight a week, but you will be losing lean muscle tissue as well as fat. This can have have a negative effect as your body can break go into starvation mode and use all sorts of trickks to shut down your metabolism, leaving your BMR far lower than it should be, and having knock on nutritional effects. Sadly as your weight reduces so to does your BMR. For those who like to get obsessive about these things Fitday.com has handy little tools for doing this and allows you keep a food and activity diary which can be worth doing for a couple of weeks, until you hit a rhythm. Weight training is a good idea for maintaining as much muscle as possible. It is not possible to actually grow muscle on a calorie deficit, although by educating the muscles you have you can get stronger, and as you lose weight the muscles can become more defined. As mentioned by Christine on page 1 muscle mass does have a higher calorie requirement to maintain than fat, so the more muscle mass you can maintain the easier it will be to lose weight in the long run.
Apologies if that sounds like a lecture from a dieting failure, and I appreciate I am repeating a lot of Christine's\Hanna's first page post, but hell, what can I say, I know what to do and why, I just can't seem to do it.