Okay, I'll tell you how I did it using some simple math and a formula I learned back in college biochemistry. Really, this works for all members of the human species...anyone who tells you their "metabolism just slowed down" hasn't really tried this.
1)You need to burn 3,500 calories to lose one pound of body fat
2)The healthiest weight loss rate is one pound per week - this means you must "burn" or eat 500 calories less than your baseline each day
3)To calculate what your current baseline is, multiply your current weight times 13 (this is for most of us who get a small amount of exercise each day just doing our everyday activities).
example) I currently weigh 115. I want to weigh 108 before my next Disney vacation. 115 times 13 = 1495 calories. This is my baseline. If I continue to eat 1495 calories every day and add no additional exercise, I will maintain my weight.
If I want to lose one pound this week, then every day I must find a way to shave off 500 calories. This means on days that I don't get on the treadmill, I must only eat 995 calories. If I get on the treadmill for my "power-workout" - 50 minutes of pushing myself hard, I usually burn 500 calories, and on that day I can eat 1495 calories. If I do my 20 minute workout (200 calories), I can eat 1195 calories.
After 7 days, I will weigh 114. This is important...you must recalculate your baseline now. It will be 114 times 13 = 1482. Now on days I don't work out, I can only eat 982 calories to maintain a 1 pound per week weight loss rate. If I burn 200 calories on the treadmill, I can eat 1182 calories.
Four weeks later, when I am at 110 pounds, my baseline will be 110 times 13 = 1430. Now I must either only eat 930 calories or workout to raise my calorie intake by the amount burned (on days I do my 200 calorie workout, I eat 1130 calories).
Once I am at my goal of 108, my baseline will be 108 times 13 = 1404. If I want to maintain 108, I must never eat more than 1404 calories each day, or if I do, I must work out to burn those extra calories.
The only way to really do this is to keep a small notepad and actually write down absolutely everything you eat. You will be surprised how quickly it does add up.
Also, most people that hit a "plateau" in weight loss have just failed to recalculate their new baseline rate. Once you lose weight, you really do have to work even harder to keep losing weight.
I am a mom in my mid thirties, and I have struggled with maintaining what I see as an acceptable weight my whole life. At only 5'0", any extra weight really shows on me. Using this formula, I was able to lose all my baby weight and more. Six months after giving birth, I was able to wear my string bikini with pride - no cellulite, firm tummy. It was hard - I had a c section with complications afterwards which prevented me from getting on my treadmill for 3 months after giving birth.
And the first three days of this are really the hardest. I swear your body goes through a "food withdrawal" like drug addicts do. I get weak, shaky, my body sweats, and I want to just give up. When this happens, I have four words of advice..."Mint Chocolate Pria Bar". I swear it is Power Bar's gift to woman. At only 110 calories, it has lots of nice soy protein, plenty of vitamins and minerals, and tastes like a Girl Scout thin mint!!! I buy them by the case at Wal Mart. Try one...they are about 75 cents a piece and make a wonderful lunch along with a 100 calorie light yoplait yogurt.
Finally, you must be accountable to yourself. I bought a wall calendar and hung it in my kitchen. Every Saturday morning, after my 500 calorie "power-workout", I weigh myself. I then write it in small numbers on the bottom of that day on the calendar. I do this even when I am not counting calories. This way, when the weight starts to creep up again, I see it and can nip it in the bud.
Okay, that's all of my advice. I hope it helps!
-April