There are various reasons to work on losing 100 pounds if you are seriously obese.  Obviously, not everybody actually has 100 pounds to lose.  But if you do, it’s better for your health, it’s better for your general wellbeing, and it’s definitely something to consider and choose.  This being said, you can obviously really produce certain health benefits and eliminate some serious problems such as heart disease, stroke, sleep apnea, type 2 diabetes, and other problems.  Another big thing for some people is being able to fit in a regular chair, whether this is a chair at the store or a chair on the airplane. 

Likewise, it reduces the embarrassment of certain things and actually increases self confidence among other things.  A healthy BMI is not generally something most people think of.  But a healthy BMI is of course a big deal that you should think of.  However, one of the bigger things is sitting on the beach and having a healthy look in a bathing suit.  Just saying the beach is rather self explanatory to say the least.  And frankly, a big motivator for many is being able to be around when their grandkids are growing up.  That should be a big factor to be completely honest.