I just don't get it. What I don't get is how quickly fats get that way.  A year and a half ago, I was in probably the best shape of my life.  I had been through a breakup, and combated the stress with working out.  I build lean muscle, as I was 6' and only 145, but I was cut.  Since then, I have not been exercising a lot, and have been drinking a lot of sodas; my one vice.  It took me a year and a half to get up to about 158 and I am not happy with it.  I can't imagine gaining 100lbs in a year and not doing something about it.  It's sickening.  My GF who is 5'8" and all of 120lbs is perfectly happy with her weight, but as she is in an intensive master's program, has lost some of her definition and we are both already starting to work out again because we want to be at our best.  Last week, I got back into the gym and stopped drinking sodas and am down 5lbs. It's really that simple, so therefore, I just don't get it.