So I have loads to lose and after years of switching from one diet to another and trying some pretty extreme ways to lose weight, I have decided to do basic calorie counting. Once I've shifted a couple of stone focussing on portion sizes and sticking to a certain calorie level, then I will maybe do something like low sugar but for now I would be happy to just shift some stones. My question is that on the NHS website it says that I need 2500 calories due to my bmi, but on fitness pal it says I need 1990, which is what I've been sticking to. I personally think they are both quite high but at least I'm not hungry so more chance that I'll stick to it long term. Could I really lose weight on 2500?