Read this post — I love this post — it really shows why Scales do not tell the whole story or even most of the story:

Now that you are done staring in amazement, eyes darting back and forth between the two Debs and down to “155lbs” to make sure you read it right, let this information really sink in.  Let it change your perspective to something healthier.  Forever!

Now go throw away your scale.

Faced with the facts above, basing your goals – or even worse, your happiness – on the number on your scale is absolutely ridiculous.  I’ll give you an example of why weight is useless information in all but extreme cases.  Let’s pretend Deb came to me at a weight of 200 lbs and told me she wanted to get down to 155 lbs.  Which side of the picture above do you think she would prefer?  Do you think she would have been satisfied with the left side?  Look at her face.  She is ecstatic with her body on the right, but on the left she can hardly stand to have her picture taken.  We can glean from this that goals based on weight are too vague to be useful.  If I had only given you her circumference measurements (waist, hips, thighs, bust, etc.) and no photos, there is absolutely no doubt in my mind which 155 lb Deb you would have chosen as the more aesthetically appealing.  But when you look in the mirror and see a body like the Deb on the left you probably say, “Damn, I need to lose some weight.”  Now you have undeniable evidence that defies that thought.  Losingweight is not what you want and pursuing a number on your scale is not the path to success.  It will drive you insane, though.  But that’s probably not your goal.

Change your perspective to something healthier.  Forever!