Hi Will,
If you're finding the MFP app confusing, this website might make things a bit more simple for you:
How Many Calories Do I Require To Lose Weight?
You enter your gender, age, current weight, activity level and height...
Then you put in how much weight you want to lose and in what time-frame, and it tells you the calories to eat per day, each week, to reach that goal.
If the amounts of calories are shown in yellow, it means this is too low to be healthy, and you should lengthen the time-frame or put in less weight to lose or increase your exercise, which means you can eat more.
So, your start weight is 217 pounds...and you want to get to under 13 stone, which is 181 pounds or less, so you want to lose 36 pounds. I'm going to make a random guess that you're 6ft tall and I've entered your activity level as 'light' (you can go to the page yourself and tweak those values). I'm also guessing that you're male. Therefore, with those values, to lose 36 pounds, you could do that in 4-5 months (by May / June 2013) by eating around 1500 calories per day. That would be safe.
With taking multi-vitamins / supplements, please be aware that this doesn't necessarily give you a 'pass' to eat lower than healthy calories. Unless you're a doctor or a nutritionist (or doing this diet under the supervision of one of those), you may not be taking the things your body is actually missing out on, and not in the appropriate amounts to make up for not eating enough. Add to that the fact that eating low calories can really mess up your metabolism as others here have said, and it's not really worth the risk.
One more thing: this website here:
Calculate Your BMI - Standard BMI Calculator
Will also help you calculate your BMI. That's your body mass index, which is a number calculated based on your weight, age, height...and it gives you a good idea of the healthy weight range for your body.
Using the values from before, your current BMI is 29.4, which puts you just at the top of the overweight range.
When you get down to 181 pounds, your BMI will be 24.5, which is at the top of the normal weight range. That's if you're 6ft, which was a guess on my part.
I hope these websites help you and good luck on your journey! Fantastic that you're here
