It's crunch time.. wedding in 4 months

Hi I'm also dieting for my wedding. That many weeks sounds like a reasonable time to lose that. I'm getting married in October but using my holiday at the end of May as an initial goal. It seems like a reasonable goal in 20 weeks to lose 2 stone. There are so many factors that influence whether 1200 is about right - current weight, amount/intensity of exercise (if any) etc. I'm on about 1300 per day but I'm exercising and I'm not that overweight. I'm more interested in getting back to a size 10 after going up to a size 12 so trying not to look at the scale too much although it is always there nagging me to get on it as I seem to be losing at a very very slow speed although my waist measurements are reducing.