Of course, there are quite a few reasons you shouldn't use the scale alone as a tool to gauge your progress. However, I am only going to talk about one of those reasons. My scale was literally lying to my face. I was using one of the old style scales and it would give me different readings. I got tired of it acting up, so I went and bought a snazzy new digital scale. I also had suspicions because every time I would be weighed on a doctor scale it said I weigh more. Well, it turns out that my old scale was being too kind and was telling me that I weigh 6 pounds less than I really do. That doesn't mean that I didn't still lose those three pounds last week. It does mean that my starting weight was 6 pounds higher. Talk about a low blow. My starting weight is actually 193 pounds and I am now 190 pounds. Rather than 187 and 184. Yes, it really sucks but it doesn't mean anything when I think about it. If I hadn't found out soon enough then it may have affected me more drastically . Even then, I still have my progress pictures and my measurements to fall back on. Those will never lie to me! So the moral of the story is, gauge your progress using mutliple tools and you are less likely to go awry when one gets messed up or is less than your desired result. You can also gauge it on how you feel as well. I took pictures, measurements, and I'm using the scale. I also feel so much better already.
