I've been on a pretty simple diet (lifestyle) the last year or so. Keep in mind when I started I weighed about 175 and was moving toward a 34 waist. Now I am at 165 with a comfortable 32 waist. I decided the dad bod wasn't going to be for me so I made 4 simple changes:
1) I only drink water--no alcohol, no coffee, no soda, no tea, no fruit juices, no gatorade, etc.
2) I don't eat dessert or sugary foods--no ice cream, candy, yogurt, chocolate, cranberries, etc.
3) I don't eat fast food--no McDonald's, Arby's, Taco Bell, BK, Subway, Dominoes, Papa John's
4) I eat only fruits for breakfast (there are your natural sugars)
Other than that, I can eat anything else I want in any amount, but I usually eat a big lunch and a small dinner (if at all) and have snacks throughout the day. I probably eat 3-4k calories a day but only exercise occasionally. My metabolism is fast but as not as fast as it used to be.
I eat lots of meat, fruits, potatoes, corn, rich, nuts, bread, and dairy. So I still get all the variety I want.