I converted my hubby who wasnt overweight or anything like that just by sticking with what I was doing. Every time I read a book I read it and gave it to him and he ended up with a stack on his bedside table...i emailed him ebooks articles links etc....sometimes I would be sitting beside him and Id say....wow look wht I just read....
Then he eventually thought.....wow shes really into this....maybe there is something in it......so he started reading...skeptical at first....then he thought....well maybe there is something in this....and he started changing his eating and that was the beginning !!
So I say you keep doing what you are doing and be enthusiastic about it....say look at this article that book....and one day you will do something and you will be fitter than him....or a health issue will resolve etc.
You will win him over...it just takes time.