[sph]

My grandma lived 95 while smoking a pack a day since her 20s.

N=1 anecdotes are not worth the energy discussing them.

Her son (my father), lived 55 while smoking a pack a day since his 20s.

--

Also, what is keto diet? I've seen keto diets made of mostly meat and organic vegetables, and keto diets made of fat bombs and almond flour pizzas.

Keto and low carb these days have stopped meaning anything, often doesn't even mean "healthier".

[Judgmentality]

If someone suggests something is a cure all for everyone, and a doctor says that cure all is killing someone, and there's medical research backing up the doctor - I'm going to trust the doctor.

My N=1 anecdote is a counterexample that has medical research to back it up. Or are you discrediting the person's anecdote about a carnivorous diet being healthy?