See, I am becoming an expert because I am thinking of becoming a consultant and selling these
mmmLatte--yeah, I have cheat days. The plan I am on is 11 days on, then 3 days off. On the off days, I can eat whatever I want, but I still try to keep it within reason and not go completely crazy. Then, it's immediately back on-plan after those 3 days for another 11 days. The week of my first "cheat" period, I still lost a quarter of a pound, so it didn't do much damage (plus I had lost 10.5 pounds total in the 2 weeks prior)
The thing is, if you weigh yourself the morning right after a cheat day, yes, you will be much higher. That is mostly because of water, though--you eat more salt and sodium and stuff on your cheat days than normal (at least I know I do!), which causes water retention. Within a few days, those extra pounds (and then some) should be gone--just increase your water intake and get right back on-plan. You CANNOT gain 5 pounds of FAT in a day--in order to do so, you would have to eat 17,500 calories MORE than you burn, which is darn near impossible (no, that's not a challenge!
). Heck, I think it would be tough to exceed 5,000 calories in one day, whch would still only be about 2,000 more than my body burns, and since there's 3,500 calories to a pound, I would still not even gain one real pound!

).
I could also try bbq sauce, since a lot of bbq sauces have fewer calories. How yummy with chicken on a salad! Wow, I need to put some of these good ideas to use!