I started by weighing every day but then discovered it became an addiction - and it started controlling my moods. If I lost I was euphoric. But if I didn't lose two or three days in a row or saw a gain I was in a horrible mood all day. So now I personally just do it once a week. If I don't lose (like last week) it is a little depressing, and I wonder if maybe I had too much salt the night before (LOL!) but the mood doesn't seem to be in control of how I feel the rest of the week. I can go ahead and enjoy life "normally". Yeah, that means I let EVERYTHING ELSE control how I FEEL!
But I've also made a lifestyle commitment so I don't need the motivation of the scale to stick to plan. I find I really like how proud I am of myself for not "cheating", for being good to myself - and of course how I am feeling in my slowly reducing body!! I LOVE CLOTHES!
Just my two cents for whatever it is worth!