I highly recommend looking at the videos on the Pound of Cure channel on You Tube, which go into detail about how to eat to lower your body's metabolic setpoint. Foods that are ultra-processed and high carb push your body's setpoint, the weight it wants to maintain, higher, where nutrient dense foods like leafy green vegetables, beans, nuts, and seeds, make your body want to maintain a lower weight.
As I have been preparing for surgery, I found the Pound of Cure book on Amazon and implemented many of the basic changes it recommends, such as cutting out processed foods, breads, sugar, and artificial sweeteners, and eating more vegetables, fruits, and beans. I lost 15 pounds in around 3 months without counting calories or ever feeling hungry. And I can also say that in the past several weeks, as the holiday treats have infiltrated my house, I have not been as good about eating that way, and to no one's surprise, my weight has shifted upward. I will be returning to better nutrition as soon as the last of the ham, sweet potatoes, and pie from Christmas dinner is out of the house!
I recommend starting with these videos that I've linked below (and then, if you're like me, binge watching the rest of Dr. Weiner's channel). I find his advice to be a common sense approach to nutrition that you should be able to implement long-term without a lot of pain. Hope this helps!