I am not sure where to post this so here goes.
Sunday I had a gallbladder attack after eating a Nacho Bell Grande and a Chalupa. Now I am kinda afraid to eat much. I am getting about 800 calories a day. Sunday when I weighed myself I was 306 and this morning the scale said 297.5. I am really not hungry, I feel full with what I have ate. My question is when I start eating the 1200-1400 calories again, is all the weight going to come back? I was thinking I should be able to lose weight with 1400 calories, a website recommended 1800 calories to lose weight.

hey, so, please please do some research on this- but from what i have read (fairly extensively, BUT not a medical opinion) i know people that are fairly obese (i'm not sure of your height- but... assuming...) i know that in that case people are put on medically supervised extremely low cal diets (600-800) and you have enough "in you" to keep your body going.

i know i really over simplified that, and please take it with 4-5 grains of salt, but i think that if you're not hungry, you're okay, BUT it is not sustainable. from a long time (and a 100 lb weight range) i can tell you that i have days where...i eat 800 or so, because im not hungry/too busy/etc.

i have other days where i eat my allotted 1800, and still lose.

i think if you're not hungry, eat whatever satisfies you- when you start getting hungry, don't restrict because that's what leads to a binge/unsustainable weight loss. this way you won't regain it back because that's just your body having it's own momentum. it's a tough call to make, but it's a hunger cue that you learn from- although eating over 1200 is definitely healthier.

i can guarantee you can lose on 1800.

I would never recommend anyone eat only 800 calories/day. Too hard to get in the nutrients and would really need to be supervised by a doctor. If that's working for you for a few days, it's fine, but it is not something for long term.

I lost regularly on 1800 calories. It was very sustainable!
People who weigh more need more calories to do everything, which is why we can lose weight on what would be maintenance calories for someone else.

When my mom had gallbladder issues, she was directed to eat a very low-fat diet. Large amounts of fat, especially in one meal, can trigger attacks.

You will lose weight eating 1800. You will lose it faster eating 1400, but you have to be more diligent about fitting enough protein and nutrients into that 1400. Rapid weight loss can actually cause gallstones, so I'd err on the side of caution and go a slower route.

Good luck!

The initial big loss is very likely a good amount of water weight and some fat. I don't know much about this medically, but as far as eating 800 calories a day, I think it's ok occasionally and if you're not feeling ill or very hungry. Otherwise, I hope you can manage to raise it up by eating healthy foods. Perhaps the Nacho Bell foods are no longer what makes your body feel good. Choose nutritionally dense foods and those that work with your condition. Way to go though! Yesterday I had one of those rare days where I wasn't hungry and I saw it as a gift from heaven. However, it hardly ever stays like that for me...I'm usually quite the opposite.