So many folks that have it say things like "I was super healthy! Did exercise, young, don't drink, etc." Then you dig deeper and realize the last vegetable meal they ate was a soggy brussel sprout their mom made them when they were 17 years old, and also eat cold cut turkey sandwiches every lunch because they're "healthy", and maybe have a tiny shred of lettuce in the sandwich. For breakfast, they eat pancakes or sug…
My armchair recommendation: avoid processed foods (but you can have processed if you're really confident what goes in isn't harmful or just very occasional I guess), eat a good amount of salads and veggies alongside some cooked main course, like beans, rice, tofu, etc.. Eat some fruits throughout the day, and a reasonable amount of water. Chew your foods well. Exercise, bla bla bla, you know the drill ;)