I've recently begun to fear for my husbands health. When I met him 4 years ago, he was slim, in shape, worked out on a regular basis, and had a fairly decent diet. Just in the past 8 months or so, he has gained about 50 pounds, he eats fast food at least 5 times a week (and not just "normal" fast food, he gets the ultra-giant 4 patty bacon cheeseburger with extra fries and a shake), and never exercises.
The weight/body fat issue is a problem to me, but it's the tiniest problem compared to the health issue. His 47 year old uncle died last year of a 100% blocked artery induced heart attack. What's worse is he died while driving on the highway. His grandfather had three bypass surgeries before passing away two years ago. His own father has dangerously high blood pressure and cholesterol. All I see when I look at him is a ticking time-bomb of heart disease. I have tried explaining the fact that I'm worried about him, worried that he won't get to see our kids (don't have any YET) grow up, won't get to enjoy life because of health problems. I haven't been critical of his size, I haven't been judgmental that he has gained weight, and yet he still hasn't even made a baby step in the right direction.
It hurts me because to me he's non-verbally saying "I don't care whether or not I live to see our son play football or our daughter graduate from college or celebrate your 60th birthday with you." How do I get him to see that he's endangering himself and me? I've completely overhauled my own eating habits in hopes that I could set a good example, but that's been almost two months and he hasn't picked up my good habits. Any suggestions?

He's probably just thinking "yeahhhhh, cheeseburger". 
