You can do 790 for a week, 1000 for a week, 1200 for a week and then 1500 for a week (check out your yellow weight care booklet).
This will allow your glycogen stores to refill gently and you should continue to lose weight so as you put a few pounds of glycogen back on you will lose a few pounds of fat.
It also allows your system to get used to calories and carbs again and doesn't shock your system or upset your tummy.
M.