[CealialactBek]

Ha ha the difference between how your body behaves in your twenties and in your forties is totally different! You can tell when you wake up in the morning!
Seriously though I think it's because you have been previously starving yourself on 800 calories. You don't say how long you did that for but I bet your hormones are still in 'hang-on-to-every-bit-you-can-get' mode. It's a fact that people who starve themselves on low calorie put it all back on again very quickly when they return to normal calorie intake. If you changed straight over to Atkins (which you're not really doing if you are so low on carbs, but that's not a problem you can do without them altogether if you want) then you need time to adjust. I would suggest you never go hungry - you need to let your body know it's OK to use that fuel and not store it this is very important. If you are hungry, eat. It's a bit difficult to get your head round that if you've been starving! Don't worry about calories, the reason you put on weight is because you have a disfunctional fat storage system, not because you eat too much. Starving yourself has made that dysfunction even worse. Keep the carbs down and your system will re-adjust and the weight WILL start to shift. Keep in touch here there is loads of support.