Daily Calorie Intake

Because you are not eating enough.

Stop putting your body into undue stress with eating so little. Your body needs more than 900 calories to function properly. Do you think you'll be happy with yourself when you pass out or collapse from dizziness?

Do your body some favors and eat the food. As long as you stick to your MFP goal, you WILL lose weight.

You really, honestly, don't need to be miserable. You don't need to beat yourself up with a lot of strenuous exercise, and you certainly don't need to limit your caloric intake to 900 calories/day.

If you're measuring your food and really know exactly how many calories you're getting, that number MFP gave you will almost certainly work just fine-- even if your exercise is limited to a 30 minute walk each day.

The weight will come off more slowly, but you'll be forming new habits in a sustainable lifestyle as you do it.

3-5 pounds a week is too much! You are not your friend who had surgery and under a doctor's care, plus everyone is different, so it is never wise to compare to one another. I suggest you go see a nutritionist and have them create you a healthy REALISTIC diet....one that is sensible, incorporates healthy life style choices, and is satisfying. "Dieting" doesn't have to be awful, but it does have to be realistic and doable.

I commend you for taking this step and wanting to make changes...but as the old adage goes....there is no quick miracle weight loss...its healthy diet, exercise AND TIME!!!!

Good luck!

It seems you do want to learn which is good. Check out the article shared in this post and I think it will help you to gain proper perspective.

http://www.myfitnesspal.com/topics/show/1017045-a-very-interesting-and-informational-read-on-deficits

And another great read can be found at
http://www.myfitnesspal.com/topics/show/1080242-a-guide-to-get-you-started-on-your-path-to-sexypants

You are definitely not eating enough. And even if you manage to not screw up your metabolism and get to your goal weight doing this, I'd be willing to bet that you gain it all back and then some because, bottom line, 900 calories a day is not sustainable for the rest of your life! Better to get where you want to be slowly and stay there than quickly and end up right back where you are now.

Just my two cents.

At nearly 300 lbs, you are not going to screw up your metabolism by eating 900 cal/day. Your body is going to consume (mostly) stored fat (stored excess calories) in order to fuel your body, as it needs it. You won't pass out, as I'm sure you have found out, if you go hungry for a period of the day. Your body converts fat into energy as you need it, like a spare fuel tank on a car.

So, 3-5 lbs/week is pretty aggressive, but you can probably do it for a while without a problem. Look at the math: 3,500 excess calories over what your body needs will be stored as 1 lb of fat. So, if you eat 500 cal/day more than your body needs, in one week you will store 1 lb of fat that you can use later.

Alternately, if you eat 3,500 cal less than you need, your body will convert 1 lb of fat into calories. Also, your body is smart enough to convert stored fat into the forms it needs (protein, fat, carbs, etc.). So, if you eat with a 500 cal/day (3,500 cal/week) deficit, you will convert 1 lb of fat into energy in one week. Do a 1,000 cal deficit per day, and you will convert 2 lbs of fat into energy in one week.

Until you are under weight, you are not going to hurt your metabolism by eating 900 cal/day. Will it "slow down"? Well, by definition, I guess so. Your body is processing 900 cal/day, rather than, say 2500 cal/day. Um, I guess you could say it needs to slow down for that, but it is not harmful.

Some people say you don't need to feel hungry to loose weight. For me, feeling hungry at some points in the day was my way of knowing that my body is converting fat to energy. That thought made me feel less grumpy. Sounds like you are dealing fine with hunger, so why change if it is working for you?

"what on Earth is wrong with my worthless body when I'm not even eating enough to be satisfied and exercising until I am exhausted and only loosing 3-5 lbs a week?"

Absolutely nothing is wrong with your body! 3-5 lbs/week is an awesome accomplishment! That is 150 to 250 lbs in a year. That is awesome.

As you lose weight, you will begin to lose more slowly. That is simple math. As you weigh less and less, your body needs less and less calories to maintain your weight. If you are still trying to lose weight, your deficit gets smaller and smaller. For example, say you need 1900 cal/day to maintain your weight (probably is much higher, but that's not the point). So, you eat 900 cal/day and have a 1000 cal/day deficit, which is 7,000 cal/week or 2 lbs/week of fat burned.

You drop 50 lbs, and maybe your need is 1400 cal/day to maintain that new weight. If you continue eating 900 cal/day, you are now at a 500 cal/day deficit, which is 3,500 cal/week or 1 lb/week of fat burned.

I'm not saying that you need to then go down to 400 cal/day. The point is don't be discouraged when you lose weight slower the closer you get to your goal. Go in to your "Goals" tab and re-adjust the numbers if necessary. As you get closer to your goal weight, 1 to 2 lbs/week is recommended.

It sounds like you are doing great. Keep up the good work! You will reach your goal. And once you get there, you will be better suited to maintain your new weight. With the discipline it will take you to reach your goal, you will have the tools to eat at maintenance for the rest of your life. You will also have the tools to lose weight if you gain some back.

It just measures your body fat (a healthy body fat percentage is between 8 and 21%). It sends a very small electric current through your body (in the case of a scale) and measures the resistance of your body to that current.

Measuring body fat is not an easy thing, so do not think that the number the scale gives you is accurate. It is a good tool to track your self. That is why it is important to always measure at the same time. I do the morning right when I wake up. I do that twice a week.

Also, BMI only takes into account weight and height, so it is not an indication of how much fat you are carrying.

This is the one scale I got myself: http://www.amazon.com/EatSmart-Precision-Capacity-Recognition-Technology/dp/B004L6NTHU/ref=sr_1_1?ie=UTF8&qid=1390230327&sr=8-1&keywords=body+fat+scale

I like it but I gguess that I got it at a special price because i did not pay 100 dollars for it.

Oh sorry, no. For a woman the healthy body fat range is higher (~15 to30% if I remember correctly)