How about just... eating food? I know, I know... so unpopular, but "Paleo, Macro..." all of that crap? Let it go. Outside of people trying to sell you shit, including books, the best advice you'll ever get is just to eat a relatively balanced diet, keep up fiber intake, and maintain a healthy weight. Whether you prefer or personally thrive more on meaty diets, or eating a lot of barley isn't really that hard to figure out.
You don't need to chug slurry 24/7, or eschew all carbs to achieve it. Avoid too much of any one thing, avoid too much processed crap (not because it's inherently bad, but because it's usually loaded with salt and sugar), and learn to cook. It's hardly a science, but you have large historical samples of people living that way, compared to a couple years of someone telling you that you can spend the rest of your days drinking the latest gray sludge.
