He's not screwed yet; he can divorce her. The real screwing is when your shitlady wife has a baby, emotionally eats her way through postpartum depression, and then won't get her ass back in gear because "her body is already ruined by the baby anyway.  what's the point?" That's when you're fucked.  If a fat ass thinks losing weight is hard they've never tried to explain to a kindergartener that daddy's moving in with his slim girlfriend because mommy's a whale.