Less is not more, when it comes to losing weight! When you make a 500-calorie deficit between what you eat and what you burn, your body will (more or less, mostly) happily shed off a pound a week. If you make a 1000-calorie daily deficit, maybe your body will begrudgingly drop a couple pounds a week. If you try and make a 1500-calorie or more daily deficit (which - you would be doing, by trying to eat in the 500-cal/day range)... you might think great, now I can drop Three Pounds A Week but instead, your body, sensing catastrophe, will do whatever it can to slow down your metabolism and stretch every last calorie as far as it can possibly go. You'll lose weight, sure, BUT it's the law of diminishing returns in effect here. You will make yourself sick, deprive yourself of essential nutrition, muck with your metabolism (which tends to show up as a "predisposition to regain quickly" later on down the road) and all this just to lose the same 2#/week that you could have been losing while eating 1200 cal/day.
Now. If you have ONE day where you feel full at 500? Maybe you're ill, and just don't feel like eating as a result.. maybe you ate a lot yesterday and are still feeling full... if it's ONE day, then really, no big deal. Your body doesn't shift into "starvation mode" at the 24-hour mark. Just... don't think you can sustain that manner of eating for several days in a row on the hope that it will speed up your weight loss. It really won't... but it will set you up for a host of other consequences that you really don't want, in the long run.
Goal 1 - break 200 (46 pounds lost)**DONE**
Goal 2 - leave obesity behind (BMI 29.9, at 185#) **DONE**
Goal 3 - BMI = Normal (154# or less)
| current weight: 164.0