Every month, I have the same setback - and no, it isn't what you think ;)
My hubby works out of town for 28 days then comes home for 5. As much as I miss him, for those 28 days, I eat great and can focus on myself & our two kids. But then I always fall off track when he gets home.
It is wonderful to have him home, but since he only has those few days, we pack as much into them as we possibly can - dinners out, meals with our families & friends, date nights, etc - and we always end up running around to fit in appointments and do maintenance on his truck, so it makes it difficult to stick to my diet & find time to work out. And if we do have time (usually in the evenings), all he wants to do is cuddle on the couch and relax. I know we should try to do some more active things together as a family while he is home, but since he walks/hikes over 40km every day while at work, all he really wants to do is rest - and all I really want to do is spend time with him, so I'm not about to ditch the kids with him and take off to hit the gym or go for a walk.
He just left a few days ago and the scale shows exactly what happens - I had lost over 8lbs the first two weeks of this challenge, and then for the third week (while he was home) I jumped back up 2lbs. I tired to make healthier decisions while he was here this time, but it was hard when we only ate 3 meals at home.
I'm already back on track with my water consumption and carb cycling, and I will try to kick it up a notch in the exercise department. My oldest just started kindergarten last week (strike here in BC delayed the start of the school year) but I still have my 3 year old at home; she's good at playing by herself for short stretches, so if I want to throw a DVD in and get a quick 20-30 min workout in, that's probably my best bet. I can't unfortunately just take off to the gym at any time like a lot of folks since I don't have someone here to take over parenting duties (and we live in a small town, so facilities are limited and there isn't reliable childcare on site), and she's not little enough anymore to throw in a stroller and go for a jog or walk. Solo parenting does present it's challenges, especially when it comes to finding time for me. Hopefully I can get her in a preschool in the new year so I can at least have a few mornings to myself each week - for the first time in 5 years!
I am already dreading next weekend - it's Canadian Thanksgiving, and since we just moved into a new house, it's apparently our turn to host. I won't be doing the cooking however, so no control over the food. I guess we'll just schedule it in as a cheat day and carry on.