I do feel for you Margot. We are a bit the opposite. DH has had a list of heath issues and surgeries over the years, and I have had relatively good health. We are in our early 60's.
However, when DH gets a bit down, and tells me that I married a faulty specimen I prop him up and support him. None of his issues are a result of his bad lifestyle, in fact he does everything right; good diet, exercise and is constantly moving. But he inherited a bad heart, varicose veins, arthritis, Dupuytrens's syndrome, etc.
We have had to stop kayaking and skiing, and while it saddens me, I understand he can't do it any more without suffering afterwards. I have gone skiing with the kids and grandkids, but don't ever push my DH to come along.
Maybe have a talk with him to help him understand that you feel bad, that you would love to do all the things that he does but your physical body stops you. Encourage him to do all the things he loves to do, but please be more understanding when you cannot. 
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. The fact remains, though, that the vast majority of people will be very aware that diet and exercise are important for weight loss. I’d be more than surprised if Margot hasn’t made that connection. She is feeling raw already - I’m sure you mean well (genuinely) but do you really think that pointing out your own slimness and good health is going to make her feel better?
