OK, it seems that a lot of people have answered the same as me. It does not bother me to be up a few/ down a few on a daily basis as long as over the week or two I'm down. If it bothers you and you get frustrated, then maybe you SHOULD do just once a week or less. I like the constant data and I understand that it's not perfectly accurate but I'm OK with that. It's a personal thing, really. Stress isn't good, so if it bothers you PERSONALLY, then do it less!
Good luck. Be strong. It WILL WORK if you do the math. ~DrToonz