I don;t think Eirikur is being nasty or judgemental. We have type 2 diabetes rife in our family too but even controlled you can;t say having a BMI of 51 and diabetes is "healthy"! Under control is NOT healthy. And diabetes is degenerative (if thats teh right way of putting it)
I speak as an adopter who had a BMI around. 40 at the time of approval (I struggle to get approved due to my weight so I can imagine 51 could be a big problem for them)
51 is in the range of being granted weight loss surgery.
BMI is a very very good guide to how overweight people are on the whole unless they are indeed in the weighlifter/professional rugby player category. IF that is your DH then it will be esy to prove by getting them to measure his fat percentage.
If his fat percentage shows he is indeed morbidly obese then I'm afraid all the justifications about how far he can cycle or how well his diabetes is under control won;t be as important as showing he is losing weight. a healthy lifestyle might be enough to sway the medical officer on the panel if his BMI was 40ish (as it was for me) but cold hard weight loss will probably be needed in order to convince then at 50+
I am sympathetic - I have been through this but the solution is in both your hands so grasp it asap and stop worrying about the hereditary issues, GP mistakes, cycleing etc and focus on tackling the real problem.
Sorry Thetimes but love is NOT enough - adoption and the issues it brings are exhausting and childrne have suffered enough loss, panel have a duty to minimise the risk of future loss however unfair it feels.