If you visit here frequently or have dealt with ALS in your life, you'll know that body weight and FVC are the two biggest indicators of disease progression.
My weight has remained steady, since my diagnosis, at approximately 205lbs.
My breathing has declined. In November 2013 my lung capacity was 53%. In February of this year it had dropped to 48%.
My FVC on Tuesday was still 48%. I don't know how it has remained the same, but I'm not complaining.