Need help convincing my father

So my dad is a full time roofer whose back has been broken since he was 16, (now going on 49) and is suffering from a very very extensive list of maladies. He’s also a cigarette smoker. The largest thing stopping him from starting the diet with me is him Mountain Dew addiction (for those unaware, it’s a very very unhealthy lemon-lime flavored soda). I’ve read him a couple of the testimonies from meatheals.com, but it hasn’t seemed to affect him very much. Any suggestions?Also, is 73% lean, 27% fat ground beef enough fat? (Its cheap and we need something low budget)

from Zero Carb Zebras https://ift.tt/2zGXvMc
via IFTTT