I have been using MFP to log everything the last 2 weeks and my calorie intake is anywhere between 850 (unintentional, was so busy it wasn't until dinner time I realised I was starving hungry) up to 1800. I have started x3 swimming sessions each week, 1 hour each and x2 20 min treadmil workouts a week. On top of three days a week at work where I do 7.5-12 hour shifts on a hospital ward so on my feet all day walking from patient to patient and some manual work too. Yet I still weigh the same as I did when I was eating 2500 calories a day and doing no swimming or running?