<human>: Could you distill the essence of the text into 1-3 sentences?

Throwaway because some people know my username. 

My brother and I are polar opposites. He is very smart, an engineer, pretty reserved, and not very street smart (i hate to say it but its true). I am very outgoing, social, and pursuing a masters in public health, and got a bachelors in Kinesiology so I am extremely health minded. After my mom died back in 2013, my brother and I had no choice but to grow closer (since its just him me and my dad now, we have a very small family) and the closer I grow the more I worry about him. He is about 6'1 and weighs close to 280lbs, maybe even more, I haven't seen him since Dec. My dad had a heart attack in Dec which makes me extremely worried because my dad and my brother both have a history of hypertension (I, thankfully, do not, and get physicals x2 a year). 

He is getting married in September and I am just worried for his health; I want him to be able to have fun at his wedding, and on his honeymoon and do not know how to talk to him without him getting angry. I am extremely bias in terms of my thinking about eating right and exercising because I have had it engrained into my brain for close to 6 years now (with my studies), and I just want him to make his health a priority. I know you cannot force someone to change, and I know that they need to do it at their own pace, but I do NOT want to have to go through my brother having a heart attack at 30 years old, and leaving his new wife a widow. I REALLY need advice on how to proceed or not proceed, because I love him so dearly, and am not ready to lose my only brother.
<bot>: Brother is extremely overweight with hypertension, and I am worried about his health now that he is getting married; not sure how to proceed.