To ask boyfriend to see GP about his weight?

[Summerconfused]

He's 6ft4 and big build so carries the weight reasonably well, but his bmi is 29, and needs to lose 3 stone to get within a healthy range. He is 46, has high blood pressure and other weight related issues. He knows he needs to lose weight but isn't really doing anything to try. I'd like him to look at options which might help but don't know how to broach it without hurting his feelings. We've been together for a year. How would you approach this?

Thanks for all the responses. For those suggesting I end the relationship - seems a bit drastic as we're happy, i am attracted to him and i dont see this as a relationship issue. I'm not trying to change him, simply find ways to support him in something he has said himself he'd like to do but is struggling to get started. I felt the independent advice of a doctor who knows his full medical history might be beneficial but clearly most people feel this will be a waste of GP time. There's some good suggestions here about doing more active things and eating healthily together, and I understand the rest needs to come from him and whether he really wants to do it.

Thanks MNers, I won't be commenting any further as this has given me the useful perspectives i was hoping for.