Overweight husband

My husband is a big guy, he's a little over 6 feet tall, and just a very solid build. He's lost some weight these last few years and kept it off, he's right around 230lbs. I know he's considered overweight/obese using a BMI chart, has anyone else had to have the talk with their husband about getting serious about his weight loss? I'm starting to think it could be affecting our chances of getting pregnant. Anyone else been in a similar situation and had a positive experience getting the DH to drop the pounds and get healthy to get pregnant???