True, but I'd still go as far as to say the majority of illnesses western people in their 40's are suffering from could have been avoided with different lifestyle choices.
If I hadn't kept fitness and eating healthy as a priority for the last 15 years, my health would've been in complete shambles by now. I was pretty lazy and self-destructive through my early adolescence, and in my early twenties I was in terrible shape physically and had a lot of severe mental problems that I no longer struggle with. I'm extremely grateful to my 22-year old self that decided to try and turn things around, it didn't happen overnight.