And the line preceding it:  I have and will always continue to struggle with my weight (but)..  This right here is why he will fail.  He thinks fat is just something you are.  He's not in it to get healthy and get fit and reap the benefits of being human.  He's convinced that losing some weight is enough, that he can somehow become less intolerable by being maybe-not-quite-as-fat-as-I-was and then probably getting even fatter as he gets older because "that's just how it works".