I mean... idk how much you work out (considering your BMR alone should be around 1400kcal if you're around 20 years), but 1800kcal seems quite high to me, at least I'd gain on that and I'm somewhat similar to your height.

Most people say high restriction around 1000-1200kcal got them to their lowest weight and maintain. As said, your BMR is 1400kcal, as long as you'd eat that you'd loose weight right now too.

 

I'm 5'4 and a half lol
I'd for sure gain on 1800 unless I'm being really active
My sedentary maintenance is just under 1,600 (My tdee)
I think either up your steps and workout more or lower your intake to around 1,000
I lost my first 12kg on Up to 1,000 a day
That being said if you're hungry all the time look at where you're getting your calories from
Protein takes longer to digest so it keeps you fuller for longer (hours) compared to low fibre high carb foods like white bread or cereal ( I still eat those things but the majority of my calories are from protein sources and vegetables/fruit)
If that doesn't work try eating your calories later in the day so you don't go to sleep hungry
I'm never really hungry until about 4 hours after I wake up

 

I calculate 1800 with a sedentary lifestyle as a surplus for you.

A lot of people do 1000-1200, but my fear is that you're already feeling very hungry already on 1800. So going that low right away may trigger a binge cycle.

I would probably recommend a slow decrease over the next few weeks to get your body conditioned. Drop to 1700, and once you can do that, 1600, etc...I would also recommend moving more..daily exercise is so important, but not just for burning calories. You need to make sure your keeping your body strong while doing all of this. You want your cardiovascular health in top condition...because once you start going lower and lower, your body will break down muscle mass...and your heart is a muscle. So...focus on getting that strong now.

I think you could safely lose on 1400, easily. However, getting down to 80 will require way more restriction...maybe set yourself a higher goal to start with, and see what you feel like at that number first.

 

Based on your stats you shouldn’t be gaining at 1800. I’m close to your height but 104 lbs, and I’m losing still at 1500. When ur a lower weight ur TDEE decreases significantly. You must not be eating exactly 1800. I would maintain at 1800 and im quite small. at your weight (which is a fine weight tbh) you should be losing if you’re consuming 1800. However if you would like to lose a tad faster, consider a different deficit. I’d recommend 1500-1600. The key to this is chose your foods wisely. protein at every meal, complex fiber filled carbs, plenty of fruits and veggies (your body metabolizes whole foods more efficiently) and treats whenever you crave one but portioned. I’ve been consistently losing and I eat pizza here and then, I eat smoothie bowls, cookies, crepes, icecream- all in a calorie deficit. But I make sure to eat things that are balanced. For example, 2 waffles will not satisfy, but 1 waffle with fruit and turkey sausages will fill you up for hours. 2 waffles is like 200 cal. 1 waffle with sausages and fruit is Also like 200 cal (100 for waffle, 60 for sausage, 40 for fruit) and will make you feel full of energy. It’s all about what you eat as well as calorie deficit, don’t let anyone convince you otherwise. Good luck

 

No sure fire meal plan but I try to eat whole foods and food with high protein or high fibre.

I try to avoid most processed foods and avoid using a lot of oil/butter. I also avoid sauces too.

I drink a lot of stuff with caffeine to suppress appetite and I generally like soups as you can bulk it up easily with veggies and beans/lentils and it keeps me feeling full for longer. I also eat a lot of lean meats, fish, eggs, tofu, beans/lentils. I avoid nuts, seeds, rice, pasta, bread, noodles etc

If you're feeling really hungry, I'd suggest to try drinking a lot more water - maybe you're dehydrated. It sounds a bit counterintuitive, but I'd also suggest to try upping the amount of fats you're eating as well. Oil and fats are very calorie dense, but they do keep you feeling full and satiated. I would suggest having some avocado or salmon.

 

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Honestly your metabolic rate might just be too slow to lose on a normal intake. I know we talked a while back and we're both in our 30's and spent a lot of years at a very low BMI... and personally my because of age and the history of being so underweight for so long, my metabolism is slow as hell now. It sucks and it's incredibly frustrating, especially since I'm partially weight restored and figured that would help, lol, but I generally maintain on around 1,500-1,600 while exercising at least an hour a day.

Getting old and dealing with the repercussions of years and years of anorexia sucks, but I'm at a loss at how to undo that damage! I know this isn't exactly an optimistic answer that you wanted to hear and I'm sorry for that!

 

1800 with not much activity could you gain. I’m 5’5 and I’d probably lose or maintain on 1800 but only because I drag a heavy backpack one hour to school and then one hour back with nearly half of the journey being walking (and then I have to walk between all my classes too, run to catch trains/buses, etc.). I think lifestyle factors influence TDEE a lot.