> Yes, I get that "lifestyle changes" could help
No. Just don't entertain this idea. You can go 20 years since the first time someone told you you may be ADHD or depressed with subsequent diagnoses. Then tell yourself it's all in behavior no one needs drugs. But twenty years on you'll still find yourself in the same cyclical patterns of periodic depression or chronic inability to select your attention to a task. "Lifestyle changes" could help with the right crutch. But if you need Ritalin or another drug to learn those lifestyle changes so be it.
In your (not quite perfect) comparison. It's as if the pill will reduce cardiac arrest and improve peoples aptitude to learn to run for 30 minutes daily.