There's a lot of misconceptions in many posts I'm reading here so let me clear something up. This notion that a 1,200 calorie diet is somehow unhealthy is absurd. In fact, it's been demonstrated over and over again that the #1 anti-aging tactic a person can employ is restrictive eating. I'm not talking about maintenance calorie eating. I'm talking about restricting calories by either not eating at all (fasting) 5 days per month, or with a low daily calorie intake.
If a person really wants to lose a ton of weight, all they have to do is stop eating.
"But wait for just a second Baron! Nobody can do that because they will lose too much muscle! ...Or their thyroid will stop working!... Or their hormones will be wrecked!"
That's just a bunch of B.S. Your body follows the laws of thermodynamics just like everything else in the universe. If you drastically limit or even stop your caloric intake altogether, you will lose fat. This was even demonstrated back in the 60's when a super fat man weighing 465 lbs fasted for a year and 17 days. You heard me... he didn't eat anything for over a year. The result: he lost 275lbs. And the only thing he ingested daily was a multivitamin and some potassium for heart health. The body isn't stupid. It's built to survive. If you stop eating, you're going to start burning body fat pretty fast and your body knows exactly how to function using your internal fat for fuel. There may be a transition period in which you feel like complete crap, but eventually, your body will adapt to that style of living and you will be completely fine as long as you have stored fat to burn.