I know what you mean. We have roving bands of punks over here in Los Angeles with "jeggings" (didn't even know what they were until a few months ago), those thin, crumply V-neck t-shirts, and giant handlebar mustaches. And occasionally tophats for no reason at all. And yeah, they're all dumber than a box of rocks. You can't hold an intelligent conversation with any of them.
1) eat real food - more vegetables, moderate meat, moderate fruits, less grains, less sugar, less vegetable oils.
2) exercise - moderate intensity cardio, sprinting, heavy lifting, dedicated stretching and mobility.
3) live - relax, de-stress, meditate.
Disclaimer: I'm not professionally qualified to make any formal recommendations. I've just done my homework and I'm my own guinea pig. All of my data, unless otherwise cited, comes from a sample size of n=1 (me).