Looking for advice on how to help my father

My dad is on the bigger side (mid 200's, mid 60's in age).

He was all the way down to the 180's around 5 or so years ago. He knows what's healthy, but he just doesn't seem motivated to eat it. He's now on a few statins to help with his blood pressure.

I've tried everything over the years to help him.

• I had a pact where I would commit to eat healthy if he would too (he would always break first).

• I tried a online betting site where I'd lose money if he didn't lose weight (he didn't care, and let me lose the money).

• I told him how much it would hurt me to see him die, and it makes him feel bad, but then he'll keep eating.

• I told him to get in ozempic, and he said he doesn't trust it, it's poison (right after eating a hot dog and a chicken bake).

I think his issues are that he gets bored, and he has absolutely zero impulse control. Worst of all- he doesn't seem to really value his own life, since he's getting old and figures "he's gonna die soon anyway". I know that he'll come to regret his actions when he's about die, but it breaks my heart to see him go down this path and to feel helpless to stop it. I don't wanna give up on him, and want to know if anyone has faced similar struggles with their older parents, and if they found any success with changing their trajectory for the better.