First, here's an interview that Jonathan Bailor, a lifestyle expert did. It's with a neurobiologist So, granted it could be complex. However, far into the interview, in fact, he provides the simple solution for losing weight and living a healthy lifestyle.
I must add: Jonathan is very knowledgeable and does conduct very good interviews. So, in no way, is this a "knock" against him. It's just an observation that far too many experts turn this into a complex subject.
Next ... Here's a picture of the Obesity System Influence Diagram. Well, if we choose this route, we'll be tied up like a pretzel and never get out of this endless maze.
That’s Apple’s primary skill and it’s a skill that’s never been more valuable. – Steve Jobs
The simple approach: To combat all the "bad" influences that are thrown at us: Our culture, our food environment, and more, just follow this simple concept: Satiety and Taste.
No details here: I go into great detail in my book and website: 101 Incredible Diet, Health and Lifestyle Tips. Here's one tip: You must be motivated. It's too easy to go in the wrong direction. So, if you are not motivated to lose weight and live a healthier lifestyle, it's not worth starting ... right now.