Scales can throw anyone for a loop! And weighing in at someone else's house means a slight variation in time of day, routine, clothing choice (unless you stripped down for both weigh-ins at your DD's house!
), and "intake so far today," all of which can make a .5 to 6-pound difference!
Even at home, I only "count" my morning weigh-ins that take place between 4:15 am and 5:15 am--my normal routine on weekdays. Anything after that, I note but do not pay attention to for good or for ill. (I tend to weigh less in the am if I sleep in till 6 or 7--and then I'm disappointed on Monday at 4:20 am when I've "gained"--but I know better.) I wear the same weight of nightgown, or my workout clothes, all of which weigh almost exactly a pound.
I don't know if this idea appeals to you, but I view weighing myself as a part of scientific observation (which is why I can tell you all the facts in my paragraphs above!), and I have managed to detach the emotion from the weight number. I sometimes record my weight daily, and then I go back to recording it once a week on the same day. I don't really even trust myself to draw any conclusions from the number that shows up (such as, "Ooh, I lost a half a pound! I guess that glass of wine yesterday didn't do any harm!"--or, "Up 2.2 pounds! It must have been that I ate too much rice yesterday."). Those kinds of inner conversations just serve to lie to myself! What really indicates success--or mistakes--is the long term.
I have been recording my weight since I started McDougalling about 5 1/2 years ago, and sometimes it was a daily weight, and most times it was weekly on the same day. It is great data to have, and interesting to look back on. It also keeps under control the urge to despair at small losses or gains of any kind. You can weigh yourself as many times a day as you want, but only the first one counts! Give yourself something to DO with the weight number, and write it down and then forget until the next time to record. Even if you do weigh yourself more often, look at it as gathering data, rather than as a judgement upon your performance!
And then in another thread I saw this morning, someone gave the idea of "not breaking the chain". They suggested that you get a calendar with a whole year on it, and mark each fully-compliant day with an "X"--and then after lots of fully compliant days, you have a nice chain to look at, and you'll be motivated not to break the chain! That sounds like fun.
And don't let the bagels call to you! Stay with MWL--it is your friend! And we are, too. We are all rooting for you!!!