I lost weight eating 2600-2800, when I was 350 lbs, and @ 440, this should not be an issue. The #1 issue is if you cut fat too low. Fat has a lot of calories.
Stop and think about if you were 220. At that point 1600 calories would be the equivalent of 800 calories for a 220 lb person. Impossible to live on. I tried to stick to 1800 calories , and failed. I was starving, and when I went over 2600, the weight started dropping quickly. @ 440 lbs., 2600 calories is not a lot of food. Get past the #, and make sure you are getting in range for all the macros, especially fat. Don't worry about the calories being too much.
Normally I would defer to the coach/dietitian here where calories are concerned, but I think I have more experience being this overweight than they do. Pre-plan for 2600 calories, split evenly as far as calories, and your macros, are concerned, and see what happens. Don't skip anything. Higher fat will get those calories up, and it won't be too much. As you lose weight the # of calories will drop. At 205 lbs, I eat closer to 1800 a day.
As you lose weight you can increase exercise if you want, although 5 hours a week @ 440 is quite a lot of exercise. I had to do my exercise in the pool, or just slow walks @ the start because I feared injury, and continue to do so, because I hate sweating.
Just keep moving, stick to the calories, and results will happen. It takes a lot of calories to maintain over 300, and even more over 400, and 2000 isn't even close. Don't worry if you cheat, just get back on track.
You might want to make your nutrition tracker public, so that a member, or a coach, maybe the dietitian could offer advice, or see if there is an issue to fix.
Russell - current BMI 28.6
197 - bmi 30 - done
164 - bmi-25
| current weight: 183.4