Eliminate or greatly reduce your intake of red meat.
Eat balanced meals. It's a very recent American phenomenon to make the meat the main feature of any and every meal. I'm not saying to remove meat entirely, but be sure to eat vegetables, grains, and fruits as well, all in their proper balance.
Research recipes that use healthier ingredients like lentils and quinoa. Lentils are a great substitute for meat as my wife's Lentil Spaghetti and Lentil Tacos attest.
Replace regular pasta with wheat pasta. (It will take some time to get used to it, but give it time and you'll adapt.)
Greatly reduce your sugar intake. No soda and no junk food. It may sound difficult (and at first, it is), but over time, your tastebuds will adapt and you may come to discover one day that Pepsi and Coke taste disgusting.
Don't eat or drink
anything with high fructose corn syrup or corn syrup.
Eat more frequently but eat smaller portions.
Keep healthy snacks like fruits, vegetables, and nuts (almonds and cashews are ideal) on hand.
If you, like me, can't let go of chocolate, buy good quality dark chocolate (minimum 70% cacao, but more than 75% gets too bitter IMO) and ditch cheap milk chocolate.
This chocolate is awesome, but Walmart doesn't carry it any more and it hasn't been in stock at Amazon for months. They may have some stock available after the US heat wave subsides, though.
I dropped about 20 pounds after cutting my sugar intake without any other changes or exercise.
And I don't know how this affects diet, but I'd recommend quitting coffee or switching from coffee to tea.
And no, I'm not a hippy. I just eat like one sometimes.