Daily 600 net calories, no weight lost. What's wrong?

I sense the OP wouldn't raise her caloric intake if God Himself told her to. The weight issue runs deeper than a few calories.

Increase your calorie intake more.

Whilst I understand that eating not enough is as bad as eating too much this is hard.. my calorie ddaily allowance is 1100, for example yesterday i burnt 1450 cals leaving me 399 net calories. i had eaten enough and cannot eat just because the calories are there to be consumed, just cannot eat if not hungry am sure thats not hjealthy either. weekly according to fitness pal i need to burn 3500 cals or there about, generally i do about 5000 or more in exercise. my calories do vary but not extensivly, maybe i go over on a saturday but 300 cals to 1500 or so but thats not bad, yet no weight loss now. just plateued...getting dispondant now as i work hard at keeping fit and healthyish.
Any ideas?

what in the world did you do to burn 1450 calories? i ran 5.5 miles on sunday and only burn 575 calories.

Few things...

It's not all simple as calories in/ calories out. At some point, your body needs to protect itself and store energy just in case it needs it (like if you have to run away from a chasing bear). Therefore, if you're taking in minimal calories, your body is gonna hold on to each and every last one of them for dear life because it can't afford to lose any.

At the VERY least, figure out your BMR. This will tell you how many calories your body needs just to FUNCTION. Like, breathe, keep organs going, blink, etc etc. If you had to be in a coma, this is the amount of calories the hospital would give you to keep your body alive. You need to eat this amount. At least.

Then, for fun, look into that In Place of a Road Map link that people have already sent you. You can find out your TDEE (total daily energy expenditure)... this is how many calories your body burns with exercise included. Do a 20% deficit from your TDEE, and you'll achieve fat loss while getting to eat more food. When you eat more, your body doesn't need to panic and hold on to the calories, so it will release them... and ta-da!

And if you haven't already, get a heart rate monitor or fitbit or the like to find out how many calories you're actually burning. I used to go by the numbers on the machines and thought I was easily burning 1000+ calories during gym visits. Turns out, not so much. 1450 is a lot of exercise calories to burn in a day.

Whilst I understand that eating not enough is as bad as eating too much this is hard.. my calorie ddaily allowance is 1100, for example yesterday i burnt 1450 cals leaving me 399 net calories. i had eaten enough and cannot eat just because the calories are there to be consumed, just cannot eat if not hungry am sure thats not hjealthy either. weekly according to fitness pal i need to burn 3500 cals or there about, generally i do about 5000 or more in exercise. my calories do vary but not extensivly, maybe i go over on a saturday but 300 cals to 1500 or so but thats not bad, yet no weight loss now. just plateued...getting dispondant now as i work hard at keeping fit and healthyish.
Any ideas?

I'm not sure you have the concept down of being "fit and healthyish." Your body needs fuel and good whole foods to be fit & healthy. You need to change your weight loss to 1/2 lb per week, eat what MFP projects for you ***PLUS*** anything you burn during exercise. If you do this, you WILL lose the weight, be healthy, and likely keep it off. What you're doing now is a recipe for disaster. Good luck, I hope you can listen to what people here are telling you, because until you believe it, you will struggle.

You know what is weird about these entries? About 12 years ago I was put on a 480-calorie diet by Weight Loss Clinics plus I was walking a lot and exercising at the gym about every other day. The weight peeled off me like nobody's business! It was astonishing.

Of course I gained the weight back within the year.

Still, if starvation mode is such a big fat hairy problem, then why in the world did I lose weight so fast on the WLC diet?

I'm probably paying for it now. Can the effects of messing with your metabolism like that last this long?

The people who like to debunk "starvation mode" usually point out that "if it were true, famine victims wouldn't die! No one would starve to death! " They're missing the point.

The original "starvation mode" experiment found drops of up to 40% in resting metabolism. Lets use that number, just for giggles.

Lets say you're a small woman. Your BMR is 1400.
If you really do drop your metabolism 40% through abuse, your new BMR is ... 840.
At 480 calories a day, that would still be a deficit of 360, before any exercise calories.

But if you didn't create such a metabolic slowdown, you could eat more food and lose the same amount of weight.

You're not eating enough and your body is angry about it.

Seems legit.

You cannot live eating that little. Right now your organs are struggling to operate properly and any weight you lose is likely lean body mass. Eat more. Calculate your BMR and TDEE
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^^^THIS^^^^

Not eating enough for your body to function means that your body starts to consume the lean muscles and healthy fat storages on your body. Just remember that some of those lean muscles make up your heart, and some of that healthy fat protects it.

Eating enough so that your body doesn't turn to survival mode (not starvation) and start eating that lean muscle and healthy fat that you already have in your body and start storing fats when you start eating enough. BMR is what I use as a minimum and everyday at the absolute least have a net of 1200 calories, although I did have trouble noticing when I didn't hit at least 1200 net. So I have figured out a better system to keep my net in the right zone while keeping a good deficit to net a healthy level of weight loss (1-2lbs per week).

Don't starve your body, you will honestly regret it in the end.

Thank you for all your comments, but I would like to specify few more things.
1) I am not eating only 600 calories/day. That number is a "net". I am eating 3 meals per day and a snack. I sleep well and feel great. I am not starving myself.
2) I am already in my "healthy weight" zone. I do understand that above normal BMI will require more daily calorie.

After reading your posts, I decided to increase my daily intake by 200-300 calories, this will add me another meals and I will now eat 4-5 meals per day. I like my exercise, it is difficult to think that i would reduce it. After all, 3lbs in 1 month is not bad at all at this point. I just need to be consistent and patient.

I am interested to hear more from people that are now in their healthy weight zone, but wants to lose an other 10-15lbs.

Thanks again!

I am in that healthy weight zone. My BMI is normal. First off, I eat 1911 calories a day based on my TDEE. My goal is .5 a week. The less weight you have to lose the longer it takes. There is no reason to net below your BMR unless your goal is to damage your metabolism. 2 pounds a week is too much for someone at a normal weight. Listen to the people here, eat more.