How do 600 pound people eat 1200 calories?

I watched my 600 pound life and the doctor put them on 1200 calories per day. How are they able to do this? I’m trying it out and I weigh 230 right now and I’m 5ft 10in I want to lose 100 pounds. I find that I’m really hungry at night in bed. Has anyone tried 1200 calories? I really want to get my weight down for my health. I put on a lot in quarantine last year.
How do 600 pound people eat 1200 calories?
Post Opinion