Although actualy specifically not promoted or talked of as a weight loss approach - Intuitive Eating.
Essential philosophy of the approach is freeing yourself from any concept of good or bad foods, no exclusions, no meal plans, eat as much as you want, (you get the idea!).
The idea is that we are very brainwashed by diet culture and body blaming and shame about food (eating to much, eating the 'wrong' foods etc). Our body and it's need for food and it's messages about hunger and fullness have been disconnected from our brain, Intuitive Eating is about reconnecting those things. When you're hungry eat, when your hungry eat exactly what and as much as you want until your body sends the message that it's full/satisfied.
Now that sounds really counter intuitive and quite scary and a recipe for massive weight gain. Actually it's the opposite. Yes, in the first few weeks, once the 'limits' are taken off its very normal to go wild and eat all the things you have denied yourself. But that's fine, you actually need to let yourself.do this if it happens so that your body starts to understand that you are denying it stuff anymore, and you learn about what foods you actually like and what and what your hunger and fullness signals are (something you may not have actually felt since childhood).
Once your brain and body are no longer at war with each over the issue of food... You level out to eating as you need. You'll probably be very surprised what you eat, when, and how much. Your weight will level out to a steady place, most people find they loose weight over time (or gain it if they have been majorly denying and are below a weight their body needs to be at), you'll have the energy you need, the emotions around eating (guilt, regret) trickle away, and there is no binge deny cycle because you don't deny so there is no urge to binge (hey if you can eat pizza (or other labelled food) any the time, what's the rush to eat it all because it's a 'treat day'?)
I've been doing this for a few years now. It's incredibly weird and scary in the first few weeks because as I said we are made to believe we know better than our bodies; but the freeing feeling of enjoying food, no restrictions, and food is fuel or for enjoyment not some slavish meal plan...it's great!
Oh and the great thing? It's ermmmm free as it's not a sign up diet plan!