Yesterday was a horrible day that could easily have gone worse. Taking my car to the garage to fix a steering problem, the reason for that problem became apparent...
You're going to find out a hell of a lot more having an open discussion with him about this than you are asking people on the internet who only know bits and pieces of the whole story.
Advice: If he wants to lose weight YOU HAVE NO RIGHT TO FORCE OR COERCE HIM OTHERWISE. He loves how he feels after losing 25 pounds- be happy that he's happy...
@clive Yes, I am in fact a serial killer who makes clothing out of his victims. This is not in any way a joke about creeps nor a reference to a major film.